Question

explain screening effect with example​

Answer 1

Screening effect:

In multi electron atoms, the outer most electron does not feel complete nuclear charge because they are shielded by inner electron. this is known as shielding effect or screening effect.

eg. multi electron atoms like Na, Mg etc.

Answer 2

Answer:

(i) Screening effect : The inner shell electrons in an atom screen or shield the outermost valence electrons from the nuclear attraction. This effect is called screening effect or shielding effect. The magnitude of screening effect depends upon the number of inner electrons. Higher the number of inner electrons, greater is the value of screening effect. The screening constant is represented by 'o' (sigma). For example, across a period the electrons enter the same shell. Thus, shielding due to inner electrons remain same. Down a group, a new larger valence shell is added which increases the inner electrons and thus the shielding effect increases