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chapter 17

TermDefinition
atom the smallest particle of an element that still retains the properties of the element
nucleus positively charged center of an atom that contains protons & neutrons & is surrounded by a cloud of electrons
proton particle, composed of quarks, inside the nucleus of an atom that has a charge of 1+
neutron neutral particle, composed of quarks, inside the nucleus of an atom
electron particles surrounding the center of an atom that have a charge of 1-
quark particles of matter that make up protons & neutrons
electron cloud area surrounding the nucleus of an atom where the atom's electrons are most likely to be found
atomic number number of protons in an atom's nucleus
mass number sum of the number of protons & neutrons in an atom's nucleus
isotope atoms of the same element that have different numbers of neutrons
average atomic mass weighted-average mass of the mixture of an element's isotope
periodic table organized list of all known elements that are arranged by increasing atomic number & by changes in chemical & physical properties
group vertical column in the periodic table
electron dot diagram uses the symbol for an element & dots representing the number of electrons in the element's outer energy level
period horizontal row in the period table
Created by: hayleereynia
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