Q78 of 400 Page 171

The atomic number of an element X is 12.
(a) What must an atom of X do to attain the nearest inert gas electron configuration?

(b) Which inert gas is nearest to X?

(a) To attain the nearest inert gas configuration the element X should must loses 2 electrons to gain the E.C of 2,8.

(b) Neon is the inert gas which is nearest to X.

A 2, 8, 1

B 2, 8, 7

C 2, 4

(a) Which of these elements is a metal?

(b) Which of these elements are non-metals?

(d) Which two elements will combine to form a covalent bond?

(e) Which element will form an anion of valency 1?

A 2, 8, 8

B 2, 8, 2

C 2, 6

D 2, 8

Which electronic configuration represents:

(i) magnesium atom?

(ii) oxygen atom?

(iii) sodium ion?

(iv) chloride ion?

(a) What must an atom of Y do to achieve the nearest inert gas electron arrangement?

(b) Which inert gas is nearest to Y?

The atomic number of an element X is 12.(a) What must an atom of X do to attain the nearest inert gas electron configuration?(b) Which inert gas is nearest to X?