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Classifying Elements
vocabulary
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 a negative electric charge. |
atomic number | the number of protons in a single atom or element. |
molecule | a particle that contains two or more atoms join together. |
metal | a substance that collects heat an electricity. |
nonmetals | a group of elements that are in 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 known elements and their properties. |