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Vocab 2.1-2.2
Vocab
| Term | Definition |
|---|---|
| atom: | a small particle that is the building block of matter |
| compound: | a substance made of two or more elements that are chemically joined in a specific combination |
| element: | a substance made of only one kind of atom |
| heterogeneous mixture: | a mixture in which two or more substances are evenly mixed, but not bonded together |
| matter: | anything that has mass and takes up space |
| mixture: | matter that can vary in composition |
| molecule: | two or more atoms that are held together by chemical bonds and act as a unit |
| substance: | matter with a composition that is always the same |
| atomic number: | the number of protons in the nucleus of an atom of an element |
| electron: | a negatively charged particle that occupies the space in an atom outside the nucleus |
| electron cloud: | the region surrounding an atom's nucleus where one of more electrons are most likely to be found |
| ion: | an atom that has a charge because it has gained or lost electrons |
| isotope: | one of two or more atoms of an element having the same number of protons, but a different number of neutrons |
| neutron: | an uncharged particle in the nucleus of an atom |
| nucleus: | the region at the center of an atom that contains most of the mass of the atom |
| proton: | a positively charged particle in the nucleus of an atom |
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