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unit 3

lessons 1-2

TermDefinition
atom the smallest particle into an element can be divided
electrons negatively charged particles
nucleus a small, dense, center of a positively charged and is surrounded by moving electrons
proton positively charged particles
neutrons uncharged particles
electron cloud area surrounded by a nucleus
atomic number the number of protons in the nucleus of an atom
mass number total number of protons and neutrons in an atom
periodic table the repeating element
chemical symbol an abbreviation for the elements name
average atomic mass an atom is the weighted average of all naturally occurring isotopes of that elements
metals elements that are shinny and conduct heat and electricity as well.
nonmetals poor conductors of heat and electricity
metalloids elements that have some properties of metals and properties of nonmetals.
group each column and elements on the periodic table
period each horizontal row in the periodic table
Created by: 18bmusleh0302