Question

Calculate the effective nuclear charge of 4S electron in scandium

Answer 1

Answer:

The effective 'nuclear charge' for 4s and 3d electrons in Sc is 1.65 and 3 respectively.

Explanation:

Answer 2

Effective nuclear charge of 4S electron in scandium is 3.

Effective nuclear charge is the total attraction experienced by the electrons on the nucleus.

Explanation:

Scandium is the element with Atomic number 21 and denoted by Sc.

Electronic configuration is 1s²2s²2p⁶,3s²,3p⁶,4s  

Effective nuclear charge Zeff = Z-σ

where Z= Atomic number

σ is screening constant

For nth orbit it is 0.35per electrons

For (n-1)th orbit is 0.85 per electrons.

For (n-2)th orbit is 1.00 per electrons.

Thus σ for (n-1) d electron =0.35× No of electrons in (n-1) d orbitals + 1.0× No of electrons in (n-1)s,(n-1)p orbitals and inner shells

=2×1+8×1+9×0.35

=18

Zeff = Z-σ

where Z=21 and σ = 18

Zeff = 21-18

Zeff = 3

Effective nuclear charge of 4S electron in scandium is 3.