| A | B |
|---|
| valence electron | have highest energy level and are held most loosely |
| electron dot diagram | includes symbol for an element surrounded by dots |
| chemical bond | force of attraction that holds two atoms together |
| metalloids | can either lose or share electrons when they combine with other elements |
| noble gases | least reactive group |
| ion | an atom or group of atoms that has an electric charge |
| polyatomic ion | a group of atoms that reacts like a unit (positvely or negaively charged) |
| ionic bond | attraction between two oppositely charged ions |
| chemical formula | a combination of symbols that shows the ratio of elements in a compound |
| ionic compound | a compound that consists of positive an negative ions |
| crystal | a orderly, three-dimensional arrangement (formed in ionic compounds) |
| covalent bond | when two atoms share electrons |
| double bond | two atoms share two pairs of electrons |
| molecular compound | a compound that is composed of molecules (has covalent bonds) |
| polar bond | a covalent bond in which atoms are shared unequally |
| nonpolar bond | a covalent bond in which atons are shared equally |
| alloy | a mixture made of two or more elements that has the properties of a metal |
| metallic bond | an attraction between a positive metal ion and the electrons surrounding it |
| subscript | tells you the ratio of elements in the compound |
| triple bond | when atoms share three pairs of electrons |
