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Unit 3 Lessons 1,2

TermDefinition
atom the smallest particle into which element can be divided and still be the same element
electron negatively charged particles
nucleus a small, dense center that has a positive charge
proton positively charged particles in the nucleus
neutron particles with no electric charge
electron cloud negatively charged parts of an atom
atomic number the number of protons in the nucleus in he atom
mass number the total number of protons and neutrons in the atoms nucleus
periodic table the arrangement of elements
chemical symbol a one,two,or three letter of a name of an element
average atomic mass the weighted average of the average
metal a element that is shiny and conducts heat
nonmetal an element that conducts heat
metalloid an element that has properties of both metals and nonmetals
group a vertical column of elements
period in chemistry, a horizontal row of elements
chemical bond an interaction that holds atoms
valence electron an electron that is found in the outermost shell
ion a charged particle
ionic bond the attraction between ions
covalent bond a bond formed when atoms share one or morepairs of electrons
molecule a group of atoms that are held together
metallic bond a bond formed by attration between positivley charged ions
Created by: 18dlooney0614
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