Question

Value of screening constant in Zn for 4s and 3d electron is
(A)
4s < 3d
(B) 4s = 3d
(C)
4s > 3d
(D) 4s < 3d​

Answer 1

Answer:4s < 3d

Explanation:

Answer 2

Given:

The element Zinc

To find:

Value of screening constant in Zn for 4s and 3d electron.

Solution:

In the case of Zinc, we need to refer to the values of nuclear charge from the Clementi-Raimondi table.

Nuclear charge ( Zeff) = exponent number ( ζ) × quantum number (n)

Value at 4s -

Other exponent number = 1.4913,

Principal quantum number = 4

Nuclear charge = 1.4913 × 4

= 5.9652

Value at 3d -

Other exponent number = 4.261

Principal quantum number = 3

Nuclear charge = 4.261 × 3

= 13.878

Thus, the values will be for 4s Zeff =5.9652  and for 3d Zeff = 13.878

Screening is larger for 4s than 3d.

Answer: The value of screening constant in Zn for 4s and 3d electron is 4s > 3d.