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Periodic table
Dalton's atomic theory
All matter made of atoms

All atoms of a given element are identical with the same mass but have different masses

from the atoms of the other elements

A compound is a combination of atoms of two more elements in a specific ratio

Atoms can…

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The nuclear atom
Electrons found in the early 20th century if atoms contain ­ive particles they must also

contain positive particles

Rutherford's gold foil experiment showed:

Atoms contain a small, central, positively charged nucleus

The diameter of the nucleus is about 1/10,000 of the atom

Almost all the mass is…

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