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Periodic Table Vocab
Periodic table
Question | Answer |
---|---|
Each row in a periodic table. | period |
A column in the periodic table. | group |
The pattern of repeating properties on the periodic table. | periodic law |
Defined as one twelfth the mass of a carbon-12 atom. Equal to the mass of a proton. | atomic mass unit |
Elements that are good conductors of electricity and heat, are solid at room temp, and malleable. | metals |
Elements that form a bridge between elements on the left and right sides of the table. | transition metals |
Elements that are poor conductors of electricity and heat, are mostly gases at room temp, and are brittle. | nonmetals |
Elements with properties that fall between metals and nonmetals. | metalloids |
Electrons in the outer energy level of an atom. | valence electrons |
Group 1A elements. | alkali metals |
Group 2A elements. | alkaline earth metals |
Group 7A elements. | halogens |
Group 8A elements. Very unreactive. | noble gases |
The possible energies that electrons in an atom can have. | energy level |