Answer :
Beryllium and Boron.
Beryllium only has two valence electrons, so it can only form up to two electron pairs.
Boron only has three valence electrons, so it can only form up to three electron pairs.
Beryllium only has two valence electrons, so it can only form up to two electron pairs.
Boron only has three valence electrons, so it can only form up to three electron pairs.