Question

Ionisation potential increases over a period from left to right because ______.

Options

• Atomic radius and nuclear charge increase.

• Atomic radius and nuclear charge decrease.

• Atomic radius increases and nuclear charge decreases.

• Atomic radius decreases and nuclear charge increases.

Answer 1

Ionisation potential increases over a period from left to right because atomic radius decreases and nuclear charge increases.

Explanation:

Across a period, the nuclear charge increases while the number of shells remains the same, so atomic radius decreases. The outer electrons are held more strongly, making them harder to remove; the other options give incorrect trends.