Question

how is Ionisation enthaply affected by nuclear charge and why​

Answer 1

$\Huge\mathcal\red{Answer}$

Effective nuclear charge implies that the net(effectice) force experienced by the electrons in the outermost shell . If Effective nuclear charge increases then the outermost electrons will be pulled stronger by the nucleus and it will require more energy to take out that electrons. So, the ionization energy increases.

Answer 2

Answer:

Size of the positive nuclear charge

As the nuclear charge increases, its attraction for the outermost electron increases and more energy is required to remove an electron. This means that the ionisation energy increases.