Question

State one reason for placing Mg and Ca in the same group of the peredoic table.​

Answer 1

Answer:

same valence shell electronic configuration

Explanation:

atomic number of Mg is 12

it's E.C is 1s2 2s2 2p6 3s2 valence shell configuration is ns2 where n=3

atomic number of Ca is 20

it's E.C is 1s2 2s2 2p6 3s2 3p6 4s2 valence shell configuration is ns2 where n=4

so general configuration is ns2

Answer 2

Magnesium(2,8,2) and Calcium(2,8,8,2) are placed in the same group as the both of them have similar valence shell configuration and thus have similar chemical properties. Moreover, Mg and Ca are alkaline earth metals. BOTH MG AND CA HAVE THE VALENCY 2. CA HAS 1 SHELL MORE THAN MG.