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Chapter 3 Vocab

Across
Mass neither destroyed nor created
Number of particles in 1 mole of a pure substance
Same elements in the same proportions
Number of protons and neutrons in the nucleus of an isotope
Smallest particle of an element
Atoms of the same element with different masses
Things that hold the nuclear particles together
Down
Ratio of small whole numbers
Naturally occurring isotopes of an element
A general term for any isotope of any element
1/12 the mass of a carbon-12 atom
Number of proportions in the nucleus
Mass of 1 mole of a pure substance
Amount of substance that contains as many particles as there are atoms in 12 g of carbon-12