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Ally Brown

Vocabulary words for chapter 5

TermDefinition
Periodic Table An arrangement of elements in columns based on a set of properties that repeat from row to row.
Period Each row of elements.
Group Each column of elements.
Periodic Law The pattern of repeating properties in a predictable way when atomic numbers are used to arrange elements into groups.
Atomic Mass Unit 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 left and right sides of the table.
Nonmetals Elements that are poor conductors of electric current and heat.
Metalloids Elements with properties that fall between those of metals and nonmetals.
Valence Electron An electron that is in the highest occupied energy level of an atom.
Alkali Metals Metals with a single valence electron and are extremely reactive.
Alkaline Earth Metals Metals with two valence electrons
Halogens Elements with seven valence electrons
Noble Gases Group 8A. Helium has two valence electrons and all the other have eight.
Created by: alyssa.brown
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