Complete the statement by highlighting the correct words. Sodium, Na, a Group 1 element, has one/two/seven/eight valence electron(s). It can easily react with chlorine, Cl, a Group 17 element, with one/two/seven/eight valence electron(s). During bonding, each sodium atom gains one/gains seven/loses one/loses seven electron(s) to become stable, and each chlorine atom gains one/gains seven/loses one/loses seven electron(s) to become stable.