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9 - Mod 4 Lesson 2

QuestionAnswer
period a sequence of elements arranged in order of increasing atomic number and forming one of the horizontal rows in the periodic table
group a column in the periodic table of elements. Sometimes referred to as a family
atomic mass unit a mass equal to ; one-twelfth the mass of an atom of carbon-12.
metals elements that are good conductors of electric current and heat
transition metals elements that form a bridge between elements on the left and right 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 in the highest occupied energy level of an atom
Created by: Ms. Greenup
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