The electron configuration of Cd2+ is [Kr] 4d10.
Cd2+ has a different electron configuration than Cd because it has lost two electrons, resulting in a different number of electrons in its outermost energy level.
Cd2+ has 0 valence electrons. Its valence electrons are the electrons in its outermost energy level, which in this case is the 4d orbital. However, since Cd2+ has a full 4d orbital, it does not have any valence electrons.
The electron configuration of Cd2+ is significant because it shows the arrangement of electrons in the atom's energy levels. This information is important in understanding the chemical and physical properties of the element.
The electron configuration of Cd2+ affects its reactivity by making it less reactive than Cd. This is because Cd2+ has a full outer energy level, making it more stable and less likely to form chemical bonds.