| A | B |
|---|
| matter | anything that has weight and takes up space |
| atoms | the building blocks of matter |
| proton | a positively charged particle in atoms |
| neutron | a neutral particle in atoms |
| electron | a negatively charged particle in atoms |
| element | a substance that cannot be broken down into a simpler substance |
| atomic number | the number of positive or negative charges in an atom |
| periodic table | a listing of elements by atomic number |
| symbol | a short way of writing the name of an element |
| atomic weight | the weight of an atom in atomic mass units; it is the same as the total number of protons and neutrons in the nucleus of the atom |
| chemical reaction | the formation of new substances |
| electrovalent compound | a compound formed when atoms borrow and lend electrons |
| covalent compound | a compound formed when atoms share electrons |
| physical properties | some properties that may be used to identify elements |
| malleable | able to be hammered without breaking |
| brittle | easily shattered |
| luster | the shine a metallic element has |
| ion | an electrically charged atom |
