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Question
Determine the values of all the four quantum numbers of the 8th electron in the O-atom and 15th electron in Cl atom.
Solution
(1) O (Z = 8) 1s2 2s2 2px2 2py1 2pz1
Four quantum numbers for 2px1 electron in oxygen atom:
n = principal quantum number = 2
l = azimuthal quantum number = 1
m = magnetic quantum number = +1
s = spin quantum number = `+1/2`
(2) Cl (Z = 17) 1s2 2s2 2p6 3s2 3px2 3py2 3pz1
Four quantum numbers for 15th electron in chlorine atom:
n = 3, l = 1, m = 0, s = `+1/2`
(3) Cr (Z = 24) 1s2 2s2 2p2 3s2 3p2 3d2 4s1
n = 3, l = 2, m = +2, s = `+1/2`
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