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Chapter 12

The Periodic Table

TermDefinition
Periodic Describes something that occurs or repeats at regular intervals.
Period Law The law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements.
Metals Elements that are shiny, malleable, ductile, good conductors of electric current and good conductors of thermal energy.
Nonmetals Elements that are not shiny, not malleable or ductile, and are poor conductors of thermal energy and electric current.
Metalloids Also known as semiconductors, are the elements that border the zigzag line on the periodic table. They have some properties of metals and nonmetals.
Period In chemistry, a horizontal row of elements in the periodic table.
Group A vertical column of elements in the periodic table; elements in a group share chemical properties.
Alkali metals The elements of Group 1 of the periodic table, which are incredibly reactive (lithium, sodium, potassium, rubidium, cesium, and francium).
Alkaline-earth metals The elements of Group 2 of the periodic table (berylium, magnesium, calcium, strontium, barium, and radium).
Halogens The elements of Group 17 of the periodic table (fluorine, chlorine, bromine, iodine, and astatine). This group combines with most metals to form salts.
Noble gases The elements of Group 18 of the periodic table (helium, neon, argon, krypton, xenon, and radon); these elements are unreactive.
Lanthanides They are shiny reactive metals (part of the transition metals).
Actinides The radio active elements that can change into different atoms (part of the transition metals).
Created by: Kenmore Science
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