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Blizzard [7]
2 years ago
5

Which statement best explains why calcium has a larger atomic radius than magnesium? A. Calcium has a stronger nuclear charge th

an magnesium. B. Calcium has electrons in more energy levels than magnesium. C. Calcium has more neutrons than magnesium. D. Calcium’s third energy level contains more electrons than magnesium
Chemistry
2 answers:
ahrayia [7]2 years ago
7 0

Answer:

B. calcium has electrons in more energy levels than magnesium

Explanation:

atoms are made of three types of subatomic particles - electrons, protons and neutrons.

Neutrons and protons reside in the nucleus of the atom and electrons reside in energy shells

electronic configuration for both Ca and Mg are as follows

Mg - 2,8,2

Ca - 2,8,8,2

outermost energy shell of Mg with electrons is the third energy level

whereas outermost energy shell of Ca with electrons is the fourth energy shell

therefore Ca has a larger atomic radius than Mg as it has one more energy shell than Mg in which electrons reside

Stella [2.4K]2 years ago
7 0

Answer: Option (B) is the correct answer.

Explanation:

Atomic number of calcium is 20 so its electronic distribution is 2, 8, 8, 2, that is, number of shells occupied will be K, L, M and N.

Whereas atomic number of magnesium is 12 so its electronic distribution is 2, 8, 2, that is, number of shells occupied will be K, L and M.

Therefore due to increase in number of shells there will be increase in atomic size of the atom.

Hence, we can conclude that the statement calcium has electrons in more energy levels than magnesium best explains why calcium has a larger atomic radius than magnesium.

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Consider the following reaction where Kc = 154 at 298 K.2NO(g) + Br2(g) 2NOBr(g)A reaction mixture was found to contain 4.64×10-
IgorLugansk [536]

Answer:

The reaction is not at equilibrium and reaction must run in forward direction.

Explanation:

At the given interval, concentration of NO = \frac{4.64\times 10^{-2}}{1}M=4.64\times 10^{-2}M

Concentration of Br_{2} = \frac{4.56\times 10^{-2}}{1}M=4.56\times 10^{-2}M

Concentration of NOBr = \frac{0.102}{1}M=0.102M

Reaction quotient,Q_{c} , for this reaction = \frac{[NOBr]^{2}}{[NO]^{2}[Br_{2}]}

species inside third bracket represents concentrations at the given interval.

So, Q_{c}=\frac{(0.102)^{2}}{(4.64\times 10^{-2})^{2}\times (4.56\times 10^{-2})}=106

So, the reaction is not at equilibrium.

As Q_{c}< K_{c} therefore reaction must run in forward direction to increase Q_{c} and make it equal to K_{c}.

4 0
2 years ago
What property of liquid oxygen makes it especially difficult and potentially harmful to work with at home?
irga5000 [103]
The property of liquid oxygen that makes it especially difficult and potentially harmful to work with at home would be its cryogenic temperature. Liquid oxygen is being produced from the compression of oxygen gas to -196 degrees Celsius. As you can see, it has a very cold temperature that is why it used in cryogenics. Although liquid oxygen is non-toxic to humans, it would cause burns that are severe when being touched. Also, it would make certain materials brittle and unstable. Another property that makes it dangerous for use at home would be that it is very flammable. Proper handling is a must for this substance.
3 0
3 years ago
Iron has a density of 7.87 g/cm3. What is the volume in cm3 of 3.729 g of iron?
KIM [24]

If iron has a density of 7.87g/cm³ and a mass of 3.729g, then the volume of iron is 0.474cm³

HOW TO CALCULATE VOLUME:

  • The volume of a substance can be calculated by dividing the mass by its density. That is;

Volume (mL) = mass (g) ÷ density (g/mL)

  • The density of iron is given as 7.87g/cm³ while its mass is 3.729g of iron. Hence, the volume can be calculated as follows:

Volume = 3.729 ÷ 7.87

Volume = 0.474cm³

Therefore, the volume of iron is 0.474cm³

Learn more: brainly.com/question/2040396?referrer=searchResults

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45.3 in. to millimeters
Stels [109]

1,150.62 millimeters

8 0
3 years ago
What does Earth's hydrosphere include? the water on Earth the hard outer part of Earth the layer of gases surrounding Earth the
Makovka662 [10]

It includes all the water on earth.

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