Question

why ionisation potential increases left to right in period?​

Answer 1

Answer:

Ionisation potential increases left to right in period because the number of electrons in valence shell increases and effective nuclear charge also increases.

Explanation:

Ionisation potential or ionisation energy is the minimum amount of energy required to remove an electron from the outermost shell of an isolated gaseous atom.

The ionisation potential increases while moving from left to right in period this is due to the increase in number of electrons in the valence shell which held tightly due to effective nuclear charge.

thus, due to increased nuclear influence greater energy required to remove an electron consequently increases ionization potential.