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for science

matter anything that has mass and occupies
element a substance composed of a single kind of atom that cannot be broken down into other substances by chemical
periodic table an organized table of all the known elements
atomic number the number of protons or electrons in an element
atomic symbol an abbreviation for the element name
atomic mass the mass of protons + neutrons (also called atomic weight or mass number)
compound a substance in which two or more elements are chemically joined in a set ratio
mixture two or more substances that are mixed together but not chemically combined
atom the smallest unit of an element that retains (or keeps) the properties
nucleus the central core of an atom that contains the protons and neutrons
proton small, positively charged particle in the nucleus of an atom
neutron small, uncharged particle in the nucleus of an atom
electron a tiny negatively charged high-energy particles that moves in the space around the nucleus of an atom
electron shells fixed orbits or path that electrons travel in around the nucleus
molecule two or more atoms that are boned togther
chemical bond the force that holds two or more atoms together
Created by: 3118083



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