Answer:
It can be chemically separated if it is a compound. The gas carbon dioxide is a pure substance.
Explanation:
Carbon dioxide is a pure substance because it has a fixed composition no matter where it was taken. Each molecule of carbon dioxide will always have 1 carbon and 2 oxygens.
Convert 15.5m³ to mL
Answer:
Explanation:
1.55e+7
Does the surface of the moon change at any time, in any way? Why or why not?
Help now please
Answer:
The moons surface is changing
Explain how writing the formula (ex. h2o + nacl) for a pure substance differs from writing the formula for a mixture.
A pure substance has a definite chemical formula. However, a mixture does not have a constant component ratio and hence cannot be described by a fixed formula.
A pure substance comprises only one type of matter. This can be a single element or a single compound, but each sample of this substance examined must have the same thing with a fixed, specific set of qualities.
In contrast, a mixture is referred to as a combination of two or more pure components. Because the atoms of the constituent substances are not chemically bound, mixtures may always be divided back into their constituent pure components.
Whereas a compound may have properties that are significantly different from the constituent's elements, however, mixtures retain their original properties.
Examples are chlorine, a strong green gas, and sodium, a soft, silvery metal. Together, these two elements can create sodium chloride (table salt), a white, crystalline substance that possesses neither the characteristics of sodium nor those of chlorine. However, if we combined ground pepper with table salt, we would still be able to distinguish the individual grains of each of them.
That's why pure substance has a definite chemical formula. However, a mixture does not have a constant component ratio and hence cannot be described by a fixed formula.
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5.0 ml of 0.10 m solution of naoh is added to 30. ml of buffer solution of acetic acid (0.093m) and sodium acetate (0.12 m). what is the ph of new solution? ka
5.0 mL of 0.10 M solution of NaOH is added to 30.0 mL of buffer solution of acetic acid (0.093 M) and sodium acetate (0.12 M). So, the pH of the new solution is 4.72
The balanced chemical equation of reaction :
CH₃COOH +H₂O → H₃O⁺ + CH₃COO⁻
kₐ = [H₃O⁺] [CH₃COO⁻] / [CH₃COOH] [H₂O]
[H3O+] = kₐ X [CH3COOH] / [CH3COO-] → 1
Let's consider the concentration of H₃O⁺ at equilibrium is x.
So,
Putting the values in equation-1
[H3O+] = ka X [CH3COOH] / [CH3COO-]
x = (1.8 X x 0.00329) / (0.0031)
x = 1.91 X
since, x is the equilibrium concentration of H₃O⁺,
So,
equilibrium concentration of H₃O⁺ = 1.91X
pH = -log 10 [H3O+]
pH = -log 10 [1.91x]
pH =4.72
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Neon has three different isotopes. 90.51% of neon atoms have a mass of 19.992 amu 0.27% of neon atoms have a mass of 20.994 amu. 9.22% of neon atoms have a mass of 21.991 amu. What is the average atomic mass of neon?
The average atomic mass of neon will be 20.179 amu.
On adding the percentage of the mass of neon given we get,
90.51%+0.27%+9.22% = 100%
Consider masses,
M1= 19.992 amu
M2= 20.994 amu
M3= 21.991 amu
on taking them as fractions and considering them as X,Y and Z, we get,
X= 0.9051
Y= 0.0027
Z= 0.0922
Average atomic mass= X(M1)+Y(M2)+Z(M3)
= 0.9051(19.992) + 0.0027(20.994) + 0.0922(21.991)
= 18.095 + 0.0567 + 2.028
= 20.179 ≈ 20.18 amu
What does atomic mass mean?Atomic mass is the amount of matter that makes up an element's atom. It is written as a multiple of 1.992646547 1023 gram, or one-twelfth the mass of the carbon-12 atom, which is given an atomic mass of 12 units.To learn more about atomic mass visit:
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1. Identify three surface processes that are
part of the rock cycle. Explain the role of
each process in the cycle. sc.7.E.6.2
0
The three processes that change one rock to another are crystallization, metamorphism, and erosion and sedimentation.
The three main elements of the rock cycle are metamorphism, erosion, and crystallization.
Crystallization:
In the earth or on the surface, magma cools and solidifies to form igneous rocks. Crystallization occurs as the magma cools, resulting in the formation of various crystals at various temperatures. For instance, olivine crystallizes from magma at temperatures substantially greater than those at which quartz does.
Sedimentation and Erosion:
Rocks at the surface of the Earth are broken down into smaller bits through weathering. These sediments are moved from one location to another by erosion in the form of running water, ice, and gravity. The accumulating sediment must be crushed and bonded together in order to form a sedimentary rock.
Metamorphism:
A rock undergoes metamorphosis when it is subjected to intense heat and pressure inside the Earth yet does not melt. The rock's texture and mineral makeup may change as a result of metamorphism. A metamorphic rock may therefore have a new mineral composition or structure.
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why do estuaries have high biodiversity? a. predators have difficulty catching prey near estuaries. b. the climate around estuaries is cold throughout the year. c. the water in estuaries is saltier than ocean water. d. the soil near estuaries is rich in nutrients.
D -The soil near estuaries is rich in nutrients, this is why estuaries have high biodiversity.
Because of the abundant food source and the efficient use of light energy by phytoplankton, which offers millions of plants and animals a tranquil haven from the open sea, estuaries have high primary output. The variety of ecosystems found inside estuaries supports a huge variety and number of organisms.
Estuaries produce a lot of primary material in part because of their physical makeup. It has a sizable surface area and more light penetrating through it.
A diversity of habitats are created in estuaries by the salinity gradient, variations in tides, freshwater, and concomitant flow in nutrients. These factors sustain a varied food web.
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Can someone write an essay for me requiring
sustainability problems in Canada
Climate change, Natural resource use, Waste production, Water pollution, Ocean acidification and Air pollution are the sustainability problems in Canada as well all over the world.
What are the sustainability problems in Canada?Climate change is the major change that occur in Canada because of the extensive use of fossil fuels and the release of other pollutants. This climate change leads to change the precipitation pattern in Canada. The extensive use of natural resource and production of waste material are also serious problems in Canada. Due to waste production, water is polluted because the waste is disposed in the water bodies which leads to acidification of ocean and serious threats to aquatic animals and plants.
So we can conclude that Climate Change, Natural Resource Use, Waste Production, Water Pollution, Ocean Acidification and Air Pollution are the sustainability problems in Canada as well all over the world.
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Consider one of the procedures where amylase and starch are reacting. If there is strong amylase activity and it is breaking down starch, then you would assign an enzyme activity level of ________.
Consider one of the procedures where amylase and starch are reacting. If there is strong amylase activity and it is breaking down starch, then you would assign an enzyme activity level of 3.
The amount of starch left in a solution or the enzyme activity can both be used to assess the enzyme activity. By including compounds like iodine to the sample, which will express, through various degrees of the blue hue, the enzyme activity level, both of them can be done qualitatively.
In the majority of enzymatic tests, the rate of substrate consumption or product generation during a specified time period is used to compute the enzyme activity. The rate of NADH oxidation is watched in the case of PDC and ADH.
An enzyme-catalyzed reaction initially progresses at a faster pace as substrate concentration rises. This rise in reaction rate levels off as the substrate saturates the enzyme molecules.
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A 100 g mass is weighed three times on a balance and the following results are obtained: 95.0g, 94.9g, 95.1
g. are these measurements accurate? are they precise?
A 100 g mass is weighed three times on a balance and the following results are obtained: 95.0g, 94.9g, 95.1 g.
These measurements are precise because the answer are almost same and are slightly different from each other.
The given measurements are not accuracy because it shows how they both close the measurement is to be true for the accepted given value.
Where as
Precision shows to how measurement value of the similar substance or particles are to each other.
In this the outcomes agree with the one another.
Both the accuracy and precision shows the answer in most generic outcomes in an experiment.
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group the elements into pairs that would most likely exhibit similar chemical properties. it does not matter which pair of elements is pair 1, pair 2, or pair 3, so long as the correct elements are paired.
The pairings of the elements can be seen like Pair 1 : ( F , Br ), Pair 2 : ( Li , K ), Pair 3 : ( P , As ) is present where the pairs exhibit similar kind of chemical properties.
How are the groups paired?Following all the groups according to these periodic table (since these elements that belong to the same kind of group exhibit similar properties) we can build the following pairs:
The Pair 1: (F , Br ) → In here because both these elements belong to the Halogens group (Group number 17)
Pair 2: ( Li , K ) → Because of the similarity and presence of both the elements belong to the Alkali metals group (Group number 1)
Pair 3: ( P , As) → Because of the similarity and presence of both the elements belong to the Pnictogens group (Group number 15)
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Complete Question
Group the elements into pairs that would most likely exhibit similar chemical properties. It does not matter which pair of elements is pair 1, pair 2, or pair 3, so long as the correct elements are paired.
Pair 1 Pair 2 Pair 3 with the Answer Bank (K, S, Li, Br, Te, F)
Neon and argon are both elements in a group of similar elements called noble gases. What properties do these elements have that make them unique?.
Answer:
they are stable
Explanation:
stable means they donot want to give or to accept electron. so that makes them stable
Bombardment of uranium-238 with a deuteron (hydrogen-2) generates neptunium-237 and __________ neutrons.
a. 1
b. 2
c. 3
d. 4
e. 5
Bombardment of uranium-238 with a deuteron (hydrogen-2) generates neptunium-237 and 3 neutrons.
What is a neutron?With the sign n or n0, the neutron is a subatomic particle with a neutral charge and slightly more mass than a proton. It is made up of two down quarks and one up quark as a composite particle. Atomic nuclei are mainly composed of neutrons & protons.
They are both referred to as nucleons because protons and neutrons exhibit comparable behaviors inside the nucleus and have masses of around one atomic mass unit apiece. Nuclear physics describes these objects' characteristics and interactions.
The arrangement of electrons in orbit around an atom's heavy nucleus is a major factor in determining its chemical characteristics. The charge of the nucleus, or atomic number, which determines the number of protons, or protons, determines the electron configuration.
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5. extend your thinking: first, using the balance, find the mass of a pumpkin on jupiter. then
place the pumpkin on the spring scale and record its weight. finally remove the pumpkin
and weigh the masses from the balance on the spring scale. how do the weights compare?
mass= 3060g weight= 75.9n
The pumpkin mass 3060 g and weight in Jupiter is 75.9 N . so, the mass of pumpkin in earth is 3060 g and the weight of pumpkin is 30.0 N.
Mass will remain same in every planet but weight changes because of force of gravity. Mass do not change with change in place. Mass is measured as the amount of matter present in body.
mass of pumpkin will not change because the amount of matter does not change. the mass of pumpkin in Jupiter is 3060 g and it will remain same for earth , 3060 g.
Weight of an object is defined as the amount of force acting on a mass due to the acceleration due to gravity.
mass of pumpkin in earth = 3060 g = 3.060kg
Weight (W) = mass of object × acceleration of gravity
= 3.060 × 9 .86
= 30.0 N
thus,The pumpkin mass in Jupiter is 3060 g and weight in Jupiter is 75.9 N . so, the mass of pumpkin in earth is 3060 g and the weight of pumpkin is 30.0 N.
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cual opcion es visible al ojo humano a simple vista kilogramo molecula mol atomo gramo
Answer:
uno
Explanation:
uno uno unooo no no Bruno capaso
help please I don’t understand and this is due tomorrow.
Answer:
9.2% is the answer
Explanation:
In this question asking for the percent error of the students calculated density. The formula that will be given;
density = 9.78g/cm^3
d = 9.78g/cm^3
accepted is on the RT table S = 8.96g/cm^3
%error = (measured - accepted)/accepted * 100%
%error = (9.78 - 8.96/8.96) * 100%
%error = 9.15% or approximately 9.2%
Scientific Scenario #3
Monobl bra
Penny wonders if a heavier cart will roll faster down-hill than a lighter one. She forms a hypothesis and then
runs an experiment. She finds a smooth ramp and a cart and makes sure that the wheels of her cart roll freely
and sets the ramp against a chair so one side of the ramp is 0.5 m off the ground. She measures the distance
the cart will travel down the ramp and leaves 10 cm at the top of the ramp and draws a line to mark the release
position of the car. She measures the distance the cart will travel down the ramp and has a stopwatch to time
how long it will take to reach the bottom. She starts the experiment by measuring the time it takes the cart to
roll down the hill without any weight on it. For the next five trials she adds a 1 kg mass to the cart each trial
(Time Trials: 1; 27s, 2; 32s, 3; 30s, 4; 29s, 5;30s). She decides to allow for a 5 second "error factor" since she
may not have released the cart at the exact same spot each time. She finds that adding mass to the cart does
not affect the time it takes to roll down the ramp since all of her times were within 5 seconds of each other.
Following are the details of the above mentioned scientific scenario:
Hypothesis: If heavier cart rolls down faster than the lighter cart.Alternative hypothesis: Adding mass to the cart makes the cart roll down faster.Null Hypothesis: Adding mass to the cart does not make the cart roll down faster.Dependent variable: time taken for the carts to roll down the inclined ramp.Independent variable: weights on the cart.Here, she observes how the independent variable, that is the weight on the cart affects the dependent variable, that is, the time taken for the carts to roll down the inclined ramp.Control group: is the cart without any weight on it.Experimental group: is the cart with different amounts of weight on it.Hence, as a result of her experiment, Penny finds the null hypothesis to be true. This is because adding mass to the cart did not change the time it took for it to roll down.
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calculate δg∘rxn and k for each of the following reactions. part a part complete the reaction of cr2 (aq) with cr2o2−7(aq) in acid solution to form cr3 (aq) . calculate δg∘rxn .
The ΔG° r×n is gven as - 1059.42 KJ
The chemical equation is given as :
[tex]6Cr{2}^{+} + Cr{2}O{7}^{2-} + 14H^{+} -------- > 8Cr^{3+} + 7HO{2}[/tex]
ΔG r×n = - nFEcell
Ecell = Eoxidation + Ereduction
Eoxidation = -Ereduction =-(-0.50V) = 0.50 V
Ereduction = 1.33 V
Ecell = 0.50 V + 1.33 V
= 1.83 V
now, putting the value in formula
ΔGr×n = -nFEcell
where , n= 6 , f = faraday's constant = 96485 C/mol, Ecell = 1.83 V
therefore, ΔG r×n = - 6× 96487 × 1.83
= -1059.42 KJ
Now, ΔG°r×n = ΔG + RTlnQ
for standard condition Q = 1
hence ΔG°r×n = - 1059.42 KJ
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A nitrogen oxide contains 30. 45% n mass. If the molar mass of the compound is 90. ± 5 g/mol, what is its molecular formula?.
The molecular formula of the compound is
[tex]N _{2}O _{4}.[/tex]
The empirical formula of the compound is,
[tex] \frac{30.4 \: g}{14.01 \: g \: mol^{ - 1} } = 2.17 \: mol \:of \: N[/tex]
[tex]\frac{69.6 \: g}{16.0 \: g \: mol^{ - 1} } = 4.35\: mol \: of \: O[/tex]
In the compound, 2.17 moles of Nitrogen are present.
In the compound, 4.35 moles of oxygen are present.
The empirical formula of the compound is
[tex]NO _{2}.[/tex]
The molecular formula of the compound is,
[tex]Molecular \: Formula = (EF) _{n}[/tex]
[tex] = 2 \times (14.01 + 2 \times 16.00) \: g \: mol ^{ - 1} [/tex]
n = 2
[tex]The \: molecular \: formula \: is \: N _{2}O _{4}[/tex]
and the compound is dinitrogen tetroxide. It is the dimer of nitrogen dioxide.
Therefore, the molecular formula of the compound is
[tex]N _{2}O _{4}.[/tex]
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Given that a mile is 1.6093km, how many kilometers do you travel if you run for a total of 43.5 minutes, 21.2 minutes of which was at the rate of 6.5 mph while the remaining 22.3 minutes was run at 7.8 mph?
The number of kilometers you travelled in 43.5 minutes is 8.4 Km
What is speed?Speed is defined as the distance travelled per unit. Mathematically, it can be expressed as:
Speed = distance / time
With the above formula, we can determie the distance (in Km) travelled. Details below.
We'll begin by calculating the distance (in Km) travelled in 21.2 mins. This is shown below:
Time = 21.2 mins = 21.2 / 60 hourSpeed = 6.5 mph = 6.5 × 1.6093 = 10.46045 Km/hDistance =?Speed = distance / time
Cross multiply
Distance = speed × time
Distance = 10.46045 × (21.2 / 60)
Distance = 3.7 Km
Next, we shall obtain the distance (in Km) travelled in 22.3 mins. This is shown below:
Time = 22.3mins = 22.3 / 60 hourSpeed = 7.8 mph = 7.8 × 1.6093 = 12.55254 Km/hDistance =?Speed = distance / time
Cross multiply
Distance = speed × time
Distance = 12.55254 × (22.3 / 60)
Distance = 4.7 Km
Finally, the total distance travelled can be obtained as follow:
Distance in 21.2 mins = 3.7 KmDistance in 22.3 mins = 4.7 KmTotal distance =?Total distance = 3.7 + 4.7
Total distance = 8.4 Km
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A substance has a pH of 8.0. How would it be classified? (1 point)
O strong acid
O strong base
O weak acid
O weak base
Answer:
Strong base
Explanation:
Answer: weak base
Explanation:
If you were stranded on a deserted island with just the things that you have with you right now and no cellular or internet connection, what kinds of things would you need to survive?
The kinds of things that would you need to survive on a deserted island are as follows:
Fresh air for proper respiration.A healthy and balanced food.Source of water for drinking. What is Survival?Survival may be characterized as the process that supports you to exist in a place where there is a lot of difficult circumstances arise. It may be of the scarcity of food, space, etc.
According to the context of this question, for the actual and fundamental survival of life, you would not need an internet or cellular connection. But in spite of this one must require fresh air, potable water, and healthy food.
Therefore, the kinds of things that would you need to survive on a deserted island are well described above.
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Explain how mass and energy are similar using the law of conservation of mass and the law of conservation of energy.
The similarity between law of conservation of mass and law of conservation of energy is that no new substance is created in both rather they are conserved.
What is law of conservation of mass?
Law of conservation of mass states that the mass can neither be created nor destroyed but is transformed from one form to another.
What is law of conservation of energy?The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another.
Example of law of conservation of energyWhen a toy car is rolled down a ramp the gravitational potential energy at the given height will be converted into kinetic energy of the toy car.
Thus, the similarity between law of conservation of mass and law of conservation of energy is that no new substance is created in both rather they are conserved.
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Which chemical equation follows the law of conservation of mass?
OA. LIOH + H₂CO3 → Li₂CO3 + 2H₂O
->
OB. 2LIOH + H₂CO3 → Li₂CO3 + H₂O
OC. 2LIOH + H₂CO3 LICO3 + 2H₂O
-
-
OD. 2LIOH + H₂CO3 → Li₂CO3 + 2H₂O
The chemical equation that follows the law of conservation of mass is as follows: 2LiOH + H₂CO3 → Li₂CO3 + 2H₂O (option D).
What is the law of conservation of mass?The law of conservation of mass states that mass can neither be created nor destroyed.
This law further explains that in a chemical reaction, the amount of mass in the reactants must be equal to the amount of mass in the products.
This means that the chemical equation must be balanced i.e. the number of moles of atoms of each element on both sides of the equation must be the same.
According to this question, the chemical equation that is balanced is 2LiOH + H₂CO3 → Li₂CO3 + 2H₂O, therefore, represents the law of conservation of mass.
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an electron and a proton are separated by a distance of 1.8×10−10 m1.8×10−10 m (roughly the diameter of a single atom). the masses of the electron and proton are me
The electric force is 2.33 × 10⁴⁹ times greater than the gravitational force.
Gravitational Force is defined as the force of magnet between any two bodies is directly commensurable to the product of their million and is equally commensurable to the forecourt of the distance between them.
Gravitational force is directly proportional to the weight of the two bodies.
Now,
The gravitational force in the middle of the proton and the electron is obtained from;
Fg = G m mp / r²
Where ,
me = mass of the electron
mp = mass of the proton
r = distance of separation
Fg = (6.67 x 10⁻¹¹ Nm² / C²) x (9.11 × 10⁻³¹) × 1.673 ×10⁻²₇/(1.8 × 10⁻¹⁰)²
Fg = 3.86 × 10⁻⁵⁸ N
For the electric force;
Fe=K e²/r²
Where,
K = electric constant
e = magnitude of charge on electron and proton
r = distance of separation
Fe = 8.988 × 10⁹x (1.602×10⁻¹⁹)² /(1.8×10⁻¹⁰)²
Fe = 7.10 × 10⁹ N
Hence, the number of time the electric force is stronger than the gravitational force = 9× 10⁻⁹ N/3.04 × 10⁻⁵⁸ N = 2.33 × 10⁴⁹times
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A classmate tries to explain why an object looks red and black. Read the two statements, and determine if your classmate was correct.
Red: "When light hits an object, it absorbs all of the frequencies of visible light except for red. The red frequency is reflected to your eyes and you see the color red."
Black: "When light hits an object, it absorbs all of the frequencies of visible light except for black. The black frequency is reflected to your eyes and you see the color black."
The classmate is correct with her statement about how red colour is seen but incorrect about how black colour is seen.
How do we see colours?There are seven colours in light as follows:
RedOrangeYellowGreenBlueIndigoVioletHowever, we are able to see these colours based on which one is reflected or absorbed. A colour is seen when it is reflected. This means that a red colour will be seen when an object absorbs all other colour but reflects red.
However, when all the colours of light are absorbed without reflecting any, an object is seen as black.
Therefore, it can be concluded that the classmate is correct with her statement about how red colour is seen but incorrect about how black colour is seen.
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Determine the number of atoms in 31. 0 grams of bromine, br. (the mass of one mole of bromine is 79. 90 g. )
By Avogadro's number, the bromine atoms are 2.34 × 10²³ atoms.
We need to know about Avogadro's number to solve this problem. Avogadro's number is the number that explains how many atoms are in one mol. The Avogadro's number is
Na = 6,02 × 10²³ atoms / mol
From the question above, we know that
gr = 31 grams
Mr = 79.9
Find the amount of bromine in moles
n = gr / Mr
n = 31 / 79.9
n = 0.39 mole
By using Avogadro's number, we can calculate how many bromine atoms
N = Na . n
N = 6,02 × 10²³ x 0.39
N = 2.34 × 10²³ atoms
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someone please help me figure out the significant figure
For each of the following chemical formulas, indicate if the substance is ionic or covalent.
A) AgF
B) C6H12O6
C) FeCi3
D)SF6
Answer:
A) Ionic (Ag is a metal and F is a nonmetal)
B) Covalent (All elements are nonmetals)
C) Ionic (Fe is a metal and Cl is a nonmetal)
D) Covalent (All elements are nonmetals)
Which is correct for the chromium isotope?
The most common isotope of chromium contains 28 neutrons in addition to its 24 protons and 24 electrons. Chromium is a strong, shiny metal with a bluish hue under normal circumstances. Thus, option C is correct.
What is chromium isotope?There are four naturally occurring isotopes of chromium, with relative abundances of 4.35%, 83.79%, 9.50%, and 2.36% for 50Cr, 52Cr, 53Cr, and 54Cr, respectively.
Numerous Chromium isotopes are employed in medical procedures. The radioisotope Cr-51, which is used to gauge blood volume and red blood cell survival, is created from Cr-50.
Studies on (adult) diabetes and chromium metabolism both use Cr-53 and Cr-54 as research tools.
Therefore, chromium isotope contain 24 protons and 28 neutrons.
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