Question

what is penetration effect​

Answer 1

Penetration Effect

Penetration describes the proximity of electrons in an orbital to the nucleus.

Electrons which experience greater penetration experience less shielding and therefore experience a larger Effective Nuclear Charge (Zeff), but shield other electrons more effectively.

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Answer 2

Question.What is penetration effect?

Answer.Penetration effect is the effect in which ionization enthalpy is increased through this effect.

e.g. Ionisation enthalpy of Aluminium is lower than that of Magnesium.