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vocab 2.1-2.2
vocb 2.1-2.2
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 |
heterogeneous | a mixture in which the substances are not evenly mixed |
homogeneous | a mixture in which two or more substances are evenly mixed, but not bonded together |
matter | anything that has 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 |
substances | matter with a composition |
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 or 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 |
neutron | an |
nucleus | the |
proton | a |