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The electronic configuration of copper ${(_{29}}Cu)$ is

• A
  $1{s^2},\,2{s^2}2{p^6},\,3{s^2}3{p^6}3{d^9}\,,4{s^2}$
• ✓
  $1{s^2},\,2{s^2}2{p^6},\,3{s^2}3{p^6}3{d^{10}},\,4{s^1}$
• C
  $1{s^2},\,2{s^2}2{p^6},\,3{s^2}3{p^6},\,4{s^2}4{p^6}$
• D
  $1{s^2},\,2{s^2}2{p^6},\,3{s^2}3{p^6}3{d^{10}}$