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Classifying Elements
term and definitions
Term | Definition |
---|---|
proton | A particle in the 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 | The number of protons in a single atom of an element. |
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 know elements and their properties. |