What is effective nuclear charge ?

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

Covalent radius of oxygen is 0.74 A^(@) and its A .R. electronegativity is 3.5 . What is the effective nuclear charge experienced by oxygen ?

What is the effective nuclear charge at the periphery of nitrogen atom when a extra electron is added during the formation of an anion. Compare the value of Z_eff when the atom is ionized to N^+ .

In which element the electrons will be experiencing the highest effective nuclear charge ? The elements are Be, B, C, N & O.

In which element the electrons will be experiencing the highest effective nuclear charge ? The elements are Be, B, C, N & O.

Calculate the effective nuclear charge at the periphery of nitrogen atom when an extre electron is added in the formation of anion . Also calculate the effective nuclear charge of N-atom.