Question

find electronic configuration of calcium if its atomic number is 20

plzz ans it correctly coz I am confused​

Answer 1

Answer:

The electronic configuration of calcium is 2,8,8,2

Answer 2

Answer:

1s^2 2s^2 2p^6 3s^2 3p^6 4s^2

Explanation:

Atomic no. Of calcium is 20

>> It contains 20 electrons.

Increasing order in energy of orbitals : 1s 2s 2p 3s 3p 4s 3d 4p

Maximum no. Of electron in,

s = 2

p = 6

d = 10

f = 14

Therefore electronic configuration of calcium,

Ca(20) = 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2

It can also be written as : [Ar]4s^2