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vocab 2.1-2.2
vocab
Term | Definition |
---|---|
matter | anything that mass and takes up space |
mixture | matter that can vary in composition |
molecule | two or more atoms that are held together by a chemical bond and act as a unit |
substance | matter with a composition that is always the same |
atom | a small particle that is the building block matter |
element | a substance made of two or more elements that are chemically joined in a specific combination |
heterogeneous | mixture in which the substances are not evenly mixed |
homogeneous | mixture in which two or more substances are evenly mixed but not boned together |
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 out side the nucleus |
electron cloud | the region surrounding an atoms 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 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 mass of the atom |
proton | a positively charged particle in the nucleus of an atom |