Which of the following isolated gaseous atoms has highest net electronic spin
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a
Sc (Z = 21)
b
Cr (Z = 24)
c
Fe (Z = 26)
d
Ni (Z = 28)
answer is B.
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Detailed Solution
Cr(Z = 24)....[Ar]4s13d5, n = 6;but in Sc(Z = 21)...[Ar]4s23d1, n = 1;Fe(Z = 26)...[Ar]4s23d6, n = 4;Ni(Z = 28)...[Ar]4s23d8, n = 2;n=number of unpaired electrons.