Question

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

Ni

Cr

Se

Cu

Answer 1

I am unsure if your teacher has taught you this, but, on a periodic table (of which you can find photos of on google) the numbers above each group how many valence electrons the atom has :) at 10 it restarts at 1

Answer 2

i would say Ni so yeah thats ur answer