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Question:

In the ground state of Cu+, the number of shells occupied, sub-shells occupied, filled orbitals and unpaired electrons respectively are: [Atomic no. of copper = 29]

4,8,15,0

4,7,14,2

3,6,15,1

3,6,14,0

Solution:

Cu+=1s²2s²2p⁶3s²3p⁶3d¹⁰
Shells occupied=3(n=1,2,3),
Subshells occupied=6
Filled orbitals=14(1+1+3+1+3+5)
Unpaired electrons=0
Hence, the correct answer is option A.