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vocab
1-2
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 |
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 |
heterogeneous | a mixture in which two or more substance are evenly mixed |
homogeneous | a mixture in which two or more substance are evenly mixed, but not bonded together |
proton | a positively charged particle in the nucleus of an atom |
nucleus | the region at the center of an atom that contains most of the mas of the atom |
neutron | an uncharged particle in the nucleus of an atom |
ion | an atom that has a charge because it has gained or lost electrons |
atomic number | the number of protons in the nucleus of an atom of an element |