Unit C Study Guide

Discontinuous Theory of Matter
matter is made up of particles so small and indestructible that they cannot be divided into anything smaller

Law of Conservation of Mass
matter is neither created nor destroyed

Law of Definite Proportions
the proportions of mass (% composition) of the elements in a SINGLE given compound is always the same

Law of Multiple Proportions
if two or more different (read multiple) compounds are composed of the same two elements, the ratio of the masses of the second element that combines with a certain mass of the first element will always be a whole number ratio

Dalton's atom
Dalton’s atom

Thomson's atom
Thomson’s atom

Rutherford's atom
Rutherford’s atom

Bohr's atom
Bohr’s atom

Current atom
Current atom

Cathode Ray Experiment
Cathode Ray Experiment

Gold Foil Experiment
Gold Foil Experiment

Mass number
is the total number of particles in the nucleus

Atomic mass
Atomic mass
the mass of the atom

Atomic Number
Atomic Number
the number of protons (and electrons) in an atom

atoms of the same element that have different numbers of neutrons

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