So we essentially took one S orbital, we took one P orbital, we combine them, and we formed two different sphypedized orbitals. Now we're going to look at SP two hybridized orbitals. So let's suppose we want to construct a BH three molecule. Now, in order to construct this molecule, we need three H atoms and one boron atom. Now, boron has five protons, so has five electrons. Two go into the one S, two go into the two S, and one goes into the two piece.