Question

Be-4th electron will have all four quantum.Numbers

Answer 1

Answer:

Not 4th electron its 4th energy level it contains all four quantum numbers that is n=4,l=3,m=-3,-2,-1,0,1,2,3 (7)s=-1/2,1/2 for all (7)m

Hope u may able to know

Answer 2

Answer:

$n = 2 \\ l = 0 \\ m = 0 \\ s = \frac{ - 1}{2}$

Explanation:

Electronic config for Be is:-

$1{s}^{2} 2 {s}^{2}$

Fourth electron is in s orbital

so n=2,l=0,m=0 and s=−1/2