Question

Question 30
The electronic configurations of three elements X, Y and Z are
X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?

(a) X is a metal.
(b) Y is a metal.
(c) Z is a non-metal.
(d) Y is a non-metal and Z is a metal.

Answer 1

Option (d) is correct.

Y has an electronic configuration - 2,8,7. It will have the tendency to gain an electron in its valence shell to achieve nearest noble gas configuration and hence complete its octet.

Z has an electronic configuration - 2,8,2. It will have the tendency to lose its 2 valence electrons to achieve nearest noble gas configuration and hence complete its octet, and is a metal.