Question

In the ground state, an atom of which element has two valence electrons?

Se
Cu
Ni
Cr

Answer 1

in groud state, the atom that has two valence electrons would be: Cr or Chromium The atoms that have two valence electrons are grouped on the second collumn in periodic tables, which is called the Alkaline earth metals. The elements that belonged to this group are: Berrylium, Magnesium, Chromium, Strontium, Barium, and radium.