Question

iv.
Which electron in an atom (Z=17) is the most shielded from
nuclear charge?
A. an electron in the 2s
B. an electron in the 3p
C. an electron in the 3d
D. an electron in the 1s

Answer 1

Answer:

3p

Explanation:

ALL THE BEST!!!!!!!!!!!!!

Answer 2

First of all, let's write the ELECTRONIC CONFIGURATION OF Z :

$\sf \: Z_{17} : {1s}^{2} \: {2s}^{2} \: {2p}^{6} \: {3s}^{2} \: {3p}^{5}$

As you can see that the valence electrons are present in 'p' orbital of Principal Quantum Number 3.

Now, since these electrons are receiving pushing effect from the inner effect (especially from 1s², 2s² and 3s²), the electrons in this orbitals will experience MAX SHIELDING EFFECT.

So , final answer is an electron in 3p.