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Chemistry Chap 4.3

Elements are different because they contain different numbers of _____. protons
atomic number number of protons in the nucleus of an element
Atoms are electrically _________. neutral
mass number total number of protons and neutrons in an atom
The number 197 in Gold-197 is the _________. mass number
Atoms that have the same number of protons but different numbers of neutrons isotopes
atomic mass unit Defined as 1/12 the mass of a carbon-12 atom
atomic mass weighted average mass of the atoms in a naturally occurring sample of an element
A weighted average mass reflects both the mass and the relative ________ of the isotopes as they occur in nature. abundance
The periodic table allows you to _____ the properties of different elements. compare
period horizontal row on the periodic table
group vertical column on the periodic table
Elements in the same ______ of the periodic table have similar properties. group
Units used to measure atomic masses amu
The number of neutrons in an atom is the difference between the ____ number and the ____ number. mass, atomic
Elements are arranged in the periodic table in order of increasing ______ ______. atomic number
Created by: phersont