• # question_answer The quantum number which may be designated by $s,\,p,\,d$ and $f$ instead of number is  BHU 1980] A)                 $n$      B)                 $l$ C)                 ${{m}_{l}}$       D)                 ${{m}_{s}}$

$l=0$ is s, l = 1is p and $l=2$ is d and so on hence $s\,p\,d$ may be used in state of no.