Calculate the effective nuclear charge experienced by the `4s`-electron in potassium atom `(Z = 19)`.

Calculate the Effective nuclear charge of helium.

What is the effective nuclear charge, felt by a 1s electron of the helium atom ?

The effective nuclear charge of N atom is :

Arrange S,P and d sub-shells of a shell in the decreasing order of effective nuclear charge (Zeff) experienced by the electron present in them

Arrange s,p and d subshells of a shell in the increasing order of effective nuclear charge (Z_(eff)) experienced by the electron present in them.

Arrange s,p and d subshells of a shell in the increasing order of effective nuclear charge (Z_(eff)) experienced by the electron present in them.

Calculate the effective nuclear charge of the last electron in an atom whose configuration is 1s^(2)2s^(2)2p^(6)3s^(2)3p^(5)