Question

Let us suppose that you have discovered a new element of atomic number 162, which you choose to name khalidium (Kh). Assume that the normal order of filling of orbitals still prevails in the eighth period. Calculate Z* in the outermost valence electron of Kh.

Answer 1

The expression for the effective nuclear charge $Z^{\ast }$ is
$Z^{\ast }=Z-S$
Here, Z is the nuclear charge and S is the shielding constant.
For khalidium (Kh), $Z=162$ and $S=157.62$
Hence, $Z^{\ast }=Z-S=162-157.62=4.38$
Hence, the effective nuclear charge that the outermost valence electron in khalidium (Kh) will experience is 4.38.