| A | B |
|---|
| element | simplest type of pure substance |
| Law of Conservation of Matter | matter can neither be created nor destroyed |
| compound | substance made up of molecules that contain more than one kind of atom; two or more elements chemically combined |
| mixture | matter that consists of two or more substances mixed but not chemically combined |
| group/family | column of elements in the periodic table |
| period | horizontal row of elements in the periodic table |
| energy levels | most likely location in an electron cloud in which an electron can be found |
| acid | compound with pH below 7 that tastes sour; turns blue litmus paper red; reacts with metals to produce hydrogen gas; ionizes in water to produce hydrogen ion; proton donor |
| salt | compound formed from a positive ion of a base and a negative ion of an acid |
| base | compound with pH above 7 that tastes bitter and is slippery to touch; turns red litmus paper blue; ionizes in water to produce hydroxide ions; proton acceptor |
| neutralization | reaction in which an acid combines with a base to form a salt and water |
| pH | measure of the hydronium ion concentration of a solution; measured on a scale of 1-14 |
| molecule | combination of atoms formed by covalent bonds |
| atom | smallest part of an element that has all the properties of an element |
| noble gas | member of family 18 of the periodic table; elements have atoms with 8 valence electrons and are extremely unreactive |
| bonding | the process when the atoms of two or more substances chemically combine |
| ionic bonding | bonding that involves the transfer of electrons |
| covalent bonding | bonding that involves the sharing of electrons |
