what are the quantum numbers of the valence electron in potassium atom (z=19) in ground state?
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first electronic config. of K = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
sp the e⁻ in 4s is our valence electron
hence its quantum no.s →
n = 4
l = 0
m = 0
s = +1 or -1
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