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classifying elements
vocab
Term | Definition |
---|---|
proton | a particle in the space inside the nucleus of an atom that carries one unit of postive electric charge. |
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electron | a particle in the space outside the neucleus of an atom that carries one unit of negative eletric 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 conducters 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. |