Beryllium has two electron shells.
Two energy shells. Made up as 1s2, 2s2 Shells 1 & 2 each have only 's' orbital and each orbital has only two electrons in it. The outer shell '2' is more energetic. The electrons are paired and spin in opposite directions to each other.
Beryllium has one valence shell containing two electrons.
Beryllium has 2 electron shells.
Beryllium has one outer electron shell with two electrons.
Only two electron shells.
Beryllium has two electron shells.
Only two electron shells.
If by energy levels you mean shells then Beryllium (Be) is in the second group and the second Period.
Beryllium
Beryllium and magnesium have two electrons in their outermost energy level, as do all Group 2 elements.
Berkelium has seven electron shells.