Q. "No two electrons in an atom can have the same set of all four quantum numbers". This principle is called
AP EAMCETAP EAMCET 2020
Solution:
Pauli's exclusion principle is, "No two electrons in an atom can have the same set of all four quantum numbers".
e.g. for $4 s^{2}$ configuration, its
$n$
$l$
$m$
$s$
$1st e^-$
$=4$
$0$
$0$
$+1/2$
$2nd e^-$
$=4$
$0$
$0$
$-1/2$
| $n$ | $l$ | $m$ | $s$ | |
| $1st e^-$ | $=4$ | $0$ | $0$ | $+1/2$ |
| $2nd e^-$ | $=4$ | $0$ | $0$ | $-1/2$ |