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Chapter 5 and 6 Crossword

Across
Computed by comparing the mass of an atom the the total mass
The formula that gives the composition of the molecules that are present
The average mass of atoms
The number equal to the number of carbon atoms in 12.01 grams of carbon
Down
Technique for counting atoms very precisely
The formula that expresses the smallest whole number ration of the atoms present
Atomic mass unit
Obtained by summing the masses of the component atoms