John Dalton’s atomic theory

Question

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Atoms are the building blocks of matter

1) All matter is comprised of small, indivisible particles called atoms

2) ...

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2) All atoms of a given element are different in properties from all atoms of other elements

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3) Matter is neither created nor destroyed after a chemical reaction (law of conservation of matter). Atoms do not transform into atoms of a different element after a chemical reaction.

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4) Elements are composed of the same shape and kind of atoms. Atoms of a given element can be arranged in differently and in different numbers, giving rise to unique identities (law of multiple proportions). now give me a medal.