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vocab 2.1-2.2


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
Created by: hamildil2963
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