Why `Ar` (argon) (at, wt. `= 39.94`) has been placed before `K` (at. Wt. `= 39.10`) in the periodic
Channel: Doubtnut
Date: 26/07/2020

Why `Ar` (argon) (at, wt. `= 39.94`) has been placed before `K` (at. Wt. `= 39.10`) in the periodic table?