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Determine the values of all the four quantum numbers of the 8th electron in O – atom and 15th electron in Cl atom and the last electron in chromium.

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(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 2s2p6 3s2 3px2 3py2 3pz1

Four quantum numbers for 15th electron in chlorine atom.

n = 3, l = 1, m = 0, s = + 1/2

n = 3, l = 2, m = +2, s = + 1/2

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