Question

what is the valency and electronic configuration of the following
1)magnesium
2)phosphorus
3)calcium​

Answer 1

$\huge\sf\ {Valency }$

1) 2

2) 3

3) 2

$\huge\sf\ {Electronic \: Configuration }$

1) 2,8,2

2) 2,8,5

3) 2,8,8,2

Answer 2

1) Magnesium has atomic number 12. It will be distributed in K, L, M shell in the following way:

K shell can accommodate a maximum of 2 electrons.

L shell can accommodate a maximum of 8 electrons and

M shell will accommodate 2 electrons

So the configuration becomes 2,8,2

2)The valence electron configuration for phosphorus is 3

Phosphorus has an electron configuration of 2,8,5

Phosphorus is found in group 15, the other non-metals on the periodic table.

3)The valency of the element is decided by the number of valence electrons. Here the number of valence electrons is 2. Therefore the valency is 2.

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