Explain shielding effect with example. Also explain 2s - 2p approach i

1.	Explain shielding effect with example. Also explain 2s - 2p approach in group and period.
Answer» Solution :In multielectron atoms the OUTERMOST electrons are shielded or screened from the NUCLEUS by the inner electrons. This is known as shielding or screening effect . Due to shielding effect, the valence ELECTRON from the nucleus by the intervening core electrons. For example : 2s electron in lithium is shielded from the nucleus by the inner core of 1s electrons. As a result the valence electron experience a net positive charge which is less than the ACTUAL charge of `+3`. Group : Shielding effect is more effective in group. If inner orbitals are completely filled in atom then shielding effect is more. Ex. Alkali metals. Period : In period, inner orbital are not increasing so effect of shielding effect is less than nuclear charge. So, 2p electrons experiencing more shielding effect than 2s electrons.

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