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 od these atoms accepts electron?
b) Which is the stable element?
c) Write down the molecular formula of the compound formed when the element A and D combine together.
d) Which element has a valency of two?

Explanation

a) D
b) B
c) .AD_2.
d). A^-.