Q.
An ion has 18 electrons in the outermost shell, it is
2668
189
AIPMTAIPMT 1990Structure of Atom
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Solution:
The electronic configuration of Cu,Th,Cs and K are Cu(29)=2,8,18,1 Cu+=2,8,18 Th(90)=2,8,18,32,18,10,2 Th4+=2,8,18,32,18,8 Cs(55)=2,8,18,18,8,1 Cs+=2,8,18,18,8 K(19)=2,8,8,1 K+=2,8,8
Thus, Cu+has 18 electrons in the outermost shell.