Question

Ionisation potential increases over a period from left to right because the;

• A. Atomic radius increases and nuclear charge increases
• B. Atomic radius decreases and nuclear charge decreases
• C. Atomic radius increases and nuclear charge decreases
• D. Atomic radius decreases and nuclear charge decreases

Answer 1

The correct option is D

Atomic radius decreases and nuclear charge decreases

Correct answer is option D) Atomic radius decreases and nuclear charge increases.

Explanation of correct answer

Definition of Ionisation potential

It is the amount of energy required to remove an electron from an isolated gaseous atom

From left to right in a period, atomic size decreases and effective nuclear charge increases.
So the force of attraction between nucleus and valence electrons increases.
Greater amount of energy is required to remove the electrons from the valence shell
Hence ionisation potential increases.