| A | B |
|---|
| valence shell | outermost energy level |
| valence electron | electron in outermost energy level |
| Noble gas | Group of elements that is inactive |
| stable octet | full outer shell - 8 valence electrons |
| ionic bond | transfer valence of electrons |
| ion | charged particle |
| cation | positively charged ion |
| anion | negatively charged ion |
| kernel | represents the nucleus and non-valence electrons |
| metallic bond | "sea of mobile electrons" |
| covalent bond | sharing of valence electrons |
| diatomic molecule | two-atom molecule |
| electron dot diagram | symbol of element using dots to represent valence electrons |
| metals | tend to form cations by losing valence electron(s) |
| nonmetals | tend to form anions by gaining valence electron(s) |
| single covalent bond | sharing of one pair of electrons |
| double bond | sharing of two pairs of electrons |
| triple bond | sharing of three pairs of electrons |
| ammonium and hydronium ions | contain coordinate covalent bonds |
| breaking a bond | endothermic-absorbs energy |
| forming a bond | exothermic-releases energy |
