Question

ionisation energy increases as we move from the left to right in a period. Why?​

Answer 1

Answer:

First you must know the definition of ionization energy.

• Definition: The energy required to remove the outermost electron from a neutral atom in its ground state.

Explanation:

• The answer for your question is that: As you move from left to right in a period, the atomic radius decreases, that is, the atom is smaller. The outer electrons are closer to the nucleus and more strongly attrached to the centre.