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Genesis Brown

Chapter 5 vocab.

TermDefinition
Period Each row in the table of elements.
Group Each column on the periodic table.
Periodic Law Pattern of repeating properties.
Atomic Mass Unit (amu) Defined as one twelfth the mass of a carbon-12 atom.
Metals Elements that are good conductors of electric current and heat.
Transition Metals Elements that form a bridge between the elements on the right and left sides of the periodic table.
Nonmetals Elements that are poor conductors of heat and electric current.
Metalloids Elements with properties that fall between those of metals and nonmetals.
Valence Electron An electron that is at the highest energy level of an atom.
Alkali Metals Elements in group 1A. Single valence electron and are very reactive.
Alkaline Earth Metals Elements in group 2A. Two valence electrons.
Halogens Elements in group 7A. Seven valence electrons.
Noble Gases Elements in group 8A. Helium has two valence electrons, the other noble gases have eight valence electrons.
Periodic Table An arrangement of elements in columns, based on a set of properties that repeat from row to row.
Created by: genesis.brown
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