Question

When we move from right to lift, screnning
constant is -
A Decreases
B Increases
С
Constant
D
None
RE​

Answer 1

Answer:

A. The effective nuclear charge is the difference between the nuclear charge and the shielding by valence electrons. It is given by the expression, Z

eff

=Z−σ. Here, σ is Slater's screening constant. Hence, option A is correct.

B. On moving from left to right across a period, the value of the effective nuclear charge increases. Hence, option B is correct.

C. On moving from top to bottom in a group, the value of the effective nuclear charge decreases as the shielding effect of inner electrons increases. Hence, option C is correct.

D. There is a gradual increase in the effective nuclear charge for the f-block elements. Hence, option D is incorrect.