Question

A Cu+2 ion has an electronic structure of 1s² 2s²2p6

3s² 3p6 4sº 3d. How many "d" electrons are in a
Cu+2 ion?
Select one:
O a. 0
O b. 2
O c. 6
O d. 9

Answer 1

d is the correct answer because it has lose 2 electrons from 4s