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Stack #504954

Chapter 12 Vocab- periodic Table

Periodic describes something that occurs or repeat at regular intervals
periodic law states that the repeating chemical and physical properties of elements change periodically with the elements' atomic numbers
period in chemistry,a horizontal row of elements in the periodic table
group vertical column of elements on the periodic table
alkali metals are elements in group 1 of the periodic table
alkaline-earth metals are less reactive than alkali metals are.
halogens are very reactive nonmetals because their atoms to gain only one electron to have a complete outer level
noble gases are unreactive nonmetals and in group 18 of the periodic table.
Created by: 220734