Question

An element in period 3 whose electron affinity is zero is ______.

विकल्प

• Neon

• Sulphur

• Sodium

• Argon

Answer 1

An element in period 3 whose electron affinity is zero is argon.

Explanation:

Argon is a noble gas in period 3 with a complete outer shell, so it has zero electron affinity. Neon is also a noble gas but belongs to period 2; sulphur and sodium have non-zero electron affinities.