Question

Match the given elements with their valencies and choose the correct option.

	Column-I		Column-II
a.	Oxygen	(i)	Zero
b.	Carbon	(ii)	One
c.	Fluorine	(iii)	Two
d.	Argon	(iv)	Four

• A. a(iii), b(iv), c(i), d(ii)
• B. a(iv), b(i), c(ii), d(iii)
• C. a(iii), b(iv), c(ii), d(i)
• D. a(iv), b(iii), c(ii), d(i)

Answer 1

The correct option is C a(iii), b(iv), c(ii), d(i)

Valency is the combining capacity of an element and is determined by its number of valence electrons. Atoms react to achieve an octet (8 electrons) in the outermost shell by sharing, gaining or losing electrons.

Element	Number of valence electrons	Valency
Oxygen	6	8 − 6 = 2
Carbon	4	8 − 4 = 4
Fluorine	7	8 − 7 = 1
Argon	8	8 − 8 = 0

Hence, the correct answer is option (c).