Question

The valence electrons of an atom of which element will feel the same effective nuclear charge as the valence electrons of a beryllium (Be) atom?Select one:
a. helium (He)
b. lithium (Li)
c. magnesium (Mg)
d. oxygen (O)

Answer 1

Zeff, = Z effective nuclear charge.

let's look at beryllium has an atomic number of 4

\[Beryllium = 1s ^{2}2s ^{2}\]

Answer 2

\[Z_{Eff} = Z_{#protons} - S_{#nonValence electrons} \]