Elements `A` and `B` with their respective electronic configurations `3d^(10)4s^(1)` and `4d^(10)5s^(1)` in their outermost shell are

Options

A. Both coinage mentals
B. Both non-mentals
C. A is non-mental and B is coinage mental
D. A is a coinage mental and B is non-mental

Answer

A

Explanation

Both are coinage metals.
`3d^(10)4s^(1)-Cu, 4d^(10)5s^(1)-Ag`.