Question

calculate the effective nuclear charge of 4S electron in potassium (At . No .19 )

Answer 1

Effective nuclear charge is given by Z - S ;            Z = At No. = 19

                                                                            S= No. of core e- = 18

Hence,

19 - 18 = 1+

Answer 2

The effective nuclear charge of 4s electron in potassium is, 2.20

Explanation :

As we are given that, the element is potassium that has atomic number 19.

The electronic Configuration of (K), Potassium is,

$1s^22s^22p^63s^23p^64s^1$

Formula used to calculate the effective nuclear charge is:

$(Z_{eff})_{4s}=Z-\sigma$

and,

$\sigma$ = 0.85 × (number of electrons in (n - 1)th shell) + 1.00 × (total number of electrons in the inner shell)

= $0.85 \times 8 + 1.00 \times 10$

= $16.80$

So,

$Z_{eff}=19-16.80=2.20$

Thus, the effective nuclear charge of 4s electron in potassium is, 2.20

Learn more about : effective nuclear charge

https://brainly.com/question/9097667

https://brainly.in/question/14178426

#learnwithbrainly