Respuesta :
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
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.
