write the value of n,l,m and s rfor 20th electron of br
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N-4
L-1
M-0
S-+1/2. -1/2
Be-1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5
20 electron is in 4s2 shell
L-1
M-0
S-+1/2. -1/2
Be-1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5
20 electron is in 4s2 shell
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