Question

write down the electronics configuration of Cu, Cr, Sc. plz ans me​

Answer 1

Answer:

The electron configuration

Cu

3d10 4s1

Cr

3d5 4s1

Sc

3d1 4s2

Answer 2

Answer:

Electronics configuration of Cu :

Atomic number of Cu is 29 .

$\displaystyle{1s^2 \ 2s^2 \ 2p^6 \ 3s^2 \ 3p^6 \ 3d^{10} \ 4s^1}$

Electronics configuration of Cu

Atomic number of Cr is 24 .

$\displaystyle{1s^2 \ 2s^2 \ 2p^6 \ 3s^2 \ 3p^6 \ 3d^{5} \ 4s^1}$

In above two case :

One electron jump it order to get stability  .

We know half filled or fulfilled configuration is more stable then partial filled

Electronics configuration of Sc :

Atomic number of Sc is 21

$\displaystyle{1s^2 \ 2s^2 \ 2p^6 \ 3s^2 \ 3p^6 \ 3d^{1} \ 4s^2}$

In this case first we filled 3d orbital before 4s orbital by applying n + l rule .