How many electron in a given atom can have the following quantum numbers-
(a)`n=4.l=1`
`n=2,l=1,m=-1`,`s=+^((1)//(2))`
(c)`n=3
n=4,l=2,m=0`

Explanation

(a) l=1 refers to p-subshell which has three orbits`(p_(x),p_(y) and p_(z))` each having two electrons.Therfore , total number of electrons are 6.
(b) `l=1` refers top p -subhell, `m=-1` refers to `p_(x) or p_(y)` orbital where as, ,`s=+^((1)//(2))` indicate foe only 1 electron.
(c) Number of electrons for any energy level is given by
`2n^(2)i.e 2xx3^(2)` =18 electron.
(d) `l=2` means d- subshell and m = 0 refer to `dz^(2)` orbital
` therefore` Number of electrons are 2.