Question

Which of the following ion has 18 electrons in the outer most shell A)cu+
B)Th4+
C)Cs+
D)K+


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Answer 1

Answer:

your ans is cu+

coz copper as atomic no as 29 which means that it will lose one electron and become +ve and hence it's electronic configuration become 2,8,18

Answer 2

Answer:

A).cu+

Explanation:

Atomic no. of cu =29

by loosing electron it will gain 2,8,18 electronic configuration...