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classifying elements
Term | Definition |
---|---|
proton | a particle in space inside the nucleus of an atom that carries one unit of positive electric charge |
electron | a particle in the space outside the nucleus of an atom that carries one unit of negative electric charge |
atomic number | |
molecule | a particle that contains two or more atoms joined together |
metals | a substance that conducts heat and electricity |
nonmetal | a group of elements that are poor conductors of heat and electricity |
noble gases | the nonmetallic elements helium, neon, argon, krypton, xenon, and radon |
metalloids | a small group of elements with some properties of both metals and nonmetals |
periodic table | a chart that shows all of the known elements and their properties |