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PS chpt. 12 vocab

QuestionAnswer
periodic happening at regular intervals
periodic law repeating chemical and physical properties of elements change periodically with the elements' atomic numbers
period each horizontal row of elements on the periodic table
group each vertical column of elements on the periodic table
alkali metals elements in Group 1 of the periodic table
alkaline-earth metals less reactive than alkali metals are
halogen very reactive nonmetals because their atoms need to gain only one electron to have a complete outer level.
nobel gas unreactive nonmetals and are in Group 18 of the periodic table
Created by: jblover41597
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