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Chapter 3 Vocabulary

Across
Smallest particle of an element
Short range proton-neutron, proton-proton, and neutron-neutron forces that hold the nuclear particles together
Mass of one mole of a pure substance
Number of particles in exactly one mole of a pure substance
If two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers
Specific isotope of an element
Matter is neither created nor destroyed
Down
Amount of a substance that contains as many particles as there are atoms in exactly 12 g of carbon-12
A chemical compound contains the same elements in exactly the same proportions by mass regardless the size of the sample or source of compound
Weighted average of the atomic masses of the naturally occurring isotopes of an element
Atoms of the same element that have different masses
Exactly 1/12 the mass of a carbon-12 atom
Number of protons of each atom of that element
Total number of protons and neutrons that make up the nucleus of an isotope