Question

Given below are the electronic configuration of a few elements (symbols are not real)

A-2,8,8,2
B-2,8,8
C-2,8,1
D-2,8,7

(a) which one of these atoms accepts electrons?
(b) which is the stable element?
(c) write down the molecular formula of the compound formed when the element A and b combined together
(d) which element has a valency of 2
​

Answer 1

Explanation:

a) Atom D-2,8,7 will accept an electron because it has 7 electrons in its valence shell so it will accept an electron to complete its octet.

b)  If an atom has 2 or 8 electrons in its valence shell then they are called stable atoms hence here element B-2,8,8 is stable.

c) Element A = Ca, Element B = Ar

  They both are Isobars.

d) Element A has a valency of 2