| A | B |
|---|
| atom | particle that all atoms are made of |
| proton | positively charged, subatomic particle |
| nuetron | neutrally charged subatomic particle |
| electron | negatively charged subatomic particle |
| element | substance that contains only one type of atom and cannot be broken down by normal physical or chemical means |
| compound | substance that is made up of two or more elements chemically combined |
| mixture | substance combined in a way that they don't change their individual properties and can be separated by physical means |
| heterogeneous | a mixture that in which substances are not evenly distrubuted all throughout |
| homogeneous | a mixture in which substances are evenly distributed throughout |
| group | a column on the periodic table |
| period | a row on the periodic table |
| metal | most elements on the periodic table |
| metalloid | an element that contains both metallic and nonmetallic properties |
| nonmetal | an element that is usually a gas and doesn't conduct electricity well |
| physical property | a characteristic of a substance that doesn't change what the substance is made of |
| chemical property | a characteristic of a substance that changes what the substance is made of |
| physical change | a change that doesn't change what the substance is |
| chemical change | a change that causes the substance to change |
| reactants | the starting substances in a chemical reaction |
| products | the ending substances in a chemical reaction |
| law of conservation of mass | states that matter cannot be created or destroyed, just rearranged |
| acidic | substance with a pH less than 7 |
| basic | substance with a pH more than 7 |
| neutral | substance with a pH of 7 |
| atomic number | number of protons in an atom |
| mass number | number of protons and neutrons in an atom |
