Normally, boron has five protons and five electrons in its neutral state. But because this has a negative one charge, it has one more electron. So that means it has a total of six electrons and five protons. So two going to the one s, two going to the two s, and two going to the two p. H still has that one electron in the one s because it's neutral. Now, notice, however, now we have four h atoms. And that means when we're counting our balanced electrons, we have not one electron from h, but four electrons from h. So four times one.