So we have four electrons coming from h, and two plus two four electrons coming from our boron. So altogether, we have eight balanced electrons. So once again, we place our b in the middle, our central atom, and we place our h atoms around our b atom. So we begin by first creating sigma or covalent bonds. So we connect our b's and HS, and now we have four covalent bonds. So let's count how many electrons we have.