| A | B |
|---|
| symbol | an abbreviation for an element |
| chemical formula | notation of numbers and symbols which indicates the composition of compound and the number of atoms in one molecule of an element |
| molecule | a single atom, group of two or more atoms of the same element, or a group of atoms of different elements joined to form a compound |
| monatomic molecules | molecule made of only one atom |
| diaomic molecules | molecules made of only two atoms |
| empirical formula | indicates the simplest whole-number ratio in which the atoms of elements are present in a compound |
| molecular formula | shows the number of atoms of each element in one molecule of a compound |
| structural formula | shows the way in which atoms are joined together to form a molecule |
| metals | elements that are ductile, malleable, lustrous, and are good conductors of heat and elecricity |
| nonmetals | elements that are brittle, nonlustrous, and are poor conductors of heat and electricity |
| semimetals | elements with some properties like metals and some properties like nonmetals |
| periodic table | arrangement of elements based on their properties and interactions |
| ionic compounds | substances formed by bonding a metal to a nonmetal; union of charged atoms |
| ion | an electrically charged atom |
| formula unit | empirical formula of an ionic compound shows the lowest whole number ratio of ions needed to form the compound |
| cation | positively charged ions; usually formed by metallic elements |
| anion | negatively charged atoms; usually formed by nonmetallic elements |
| polyatomic ions | groups of atoms of more than one element that together carry a charge |
| Stock System | uses roman numerals to identify cations that can carry more than one amount of charge |
| -ous ending | used for lower charged ion of element with more than one kind of ion |
| -ic ending | used for larger charged ion of element with more than one kind of ion |
| -ide ending | used to name the anion of nonmetallic elements in an ionic compound |
| molecular compounds | substances formed by atoms that are sharing electrons and combine in many differnt ways to form molecules |
| oxidation number | the apparent amount of charge bourne by an element form a molecular compound |
| binary acid | water solutions of binary hydrogen compounds |
| ternary acid | water solutions of ternary hydrogen compound (three or more element including hydrogen) |
