Question

Why is it hard to remove Electrons from the orbit present near the nucleus ?​

Answer 1

Ans: The ionization energy of an element increases as one moves up a given group because the electrons are held in lower energy orbitals, closer to the nucleus and thus more tightly bound (harder to remove). The atomic radius decrease it because it become harder to remove electrons that is closer to a more positively charged nucleus.

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Answer 2

Explanation:

The inner electrons will be attracted to the nucleus much more than the outer electrons. Thus, the attractive forces of the valence electrons to the nucleus are reduced due to the shielding effects. That is why it is easier to remove valence electrons than the inner electrons.