Question

why does chlorine have high ionisation energy than phosphorus?​

Answer 1

Answer:

Sulfurs 3p subshell has a pair of electrons in one of its orbitals, whereas in the 3p subshell of phosphorus, there are no electron pairs in any of its orbitals, therefore it is easier to remove the electron from sulfurs 3p since the presence of an electron pair in one of its orbitals leads to increased repulsion.

Answer 2

ark me briliant

Explanation:

Cl has more one more proton than S, thus the nuclear charge of Cl is higher than that of S. The shielding effect in Cl is higher than that of S becaus there is one more electron in Cl than S. However, the one extra electron is added onto the same subshell (3p) as the valence electrons in S, hence the increase in nuclear charge outweighs the increase in shielding effect from S to Cl. Thus, valence electrons in Cl are pulled closer to the nucleus and tighter than that of S, requiring more energy to remove one electron from Cl than S. Henc, Cl has higher 1st ionization energy than that of S.