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

Se

Cu

Ni

Cr

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.

In the event that you investigate where Chromium is on the intermittent table, it is one electron far from having 5 electrons in its 3d-subshell and a more prominent general strength. Consequently, with a specific end goal to accomplish this more attractive state, one of the 4s electrons is elevated to the 3d sub shell, accomplishing the half-full orbital and bringing about just a single electron staying in the 4s (valence) shell. Copper does this too.