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Unit 3, Lesson 1-2

TermDefinition
atom the smallest particle into which an element can be divided and still be the same element
electron negatively charged particles
nucleus a small, dense center that has a positive charge and is surrounded by moving electrons
proton positively charged particles
neutron particles with no electric charge
electron cloud the region around the nucleus of an atom where electrons are likely to be found
atomic number the number of protons in the nucleus
mass number the total number of protons and neutrons in an atom's nucleus
periodic table arrangement of the elements
chemical symbol abbreviation of the chemical's name
metals elements that are shiny and conduct heat and electricity well
nonmetals poor conductors of heat and electricity
metalloids elements that have some properties of metals and some properties of nonmetals
group each vertical column of elements on the periodic table
period horizontal row of elements
Created by: 18lheatherly0923
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