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)

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)

photon336 · Answer

Zeff, = Z effective nuclear charge. 

let's look at beryllium has an atomic number of 4 

$$Beryllium = 1s ^{2}2s ^{2}$$

photon336 · Answer

$$Z_{Eff} = Z_{#protons} - S_{#nonValence electrons} $$