Answer :
Final answer:
Dalton's atomic theory proposed the idea that elements are composed of atoms with distinct properties, Thomson's experiment discovered electrons, and Rutherford's experiment revealed the nucleus in atoms.
Explanation:
Dalton's atomic theory was a significant milestone in the development of modern atomic theory. Dalton proposed that all elements are composed of atoms, each with specific properties, and that atoms of different elements can combine in fixed ratios to form compounds.
Thomson's cathode ray tube experiment revealed the existence of electrons in atoms, while Rutherford's gold foil experiment showed that atoms have a small, positively charged nucleus at their center.
Isotopes are atoms of the same element with different numbers of neutrons. For example, the three known isotopes of hydrogen are protium (^1H), deuterium (^2H), and tritium (^3H).
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