First three ionisation energies (in kJ/mol) of three representative elements are…

CHEMISTRY · Single correct · AP · Chemistry · Atomic Structure and Properties · Atomic Structure and Properties

Problem

First three ionisation energies (in kJ/mol) of three representative elements are given below :

Element	IE ₁	IE ₂	IE ₃
P	495.8	4562	6910
Q	737.7	1451	7733
R	577.5	1817	2745

Then incorrect option is : (1) Q: Alkaline earth metal (2) P: Alkali metals (3) R: s-block element (4) They belong to same period