Chapter 2 Section 1

12 terms by ngmoran1 

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atom

smallest particle of matter that contains the characteristics of an element

nucleus

central region of an atom

protons

same mass as neutron, located in nucleus

neutrons

same mass as protons, located in the nucleus

electrons

smallest of three particles in an atom, located on energy levels

valence

outermost energy level

molecule

combined atoms

compound

contains 2 or more elements chemically combined in specific proportions

atomic number

number of protons in the nucleus

mass number

total mass, protons+neutrons

isotope

atoms with the same number of protons but different number of neutrons

ion

has an electrical charge because of a gain or loss of one or more electrons

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