Dalton’s atomic theory:
Matter is made up of tiny particles called Atoms.
Atoms of same elements are same while atoms of different elements are different however discovery of Isotopes and Isobars proved him Wrong.
Isotope: Atoms of same elements with different number of neutrons or mass number.
Example of Isotopes: Hydrogen has three isotopes, Protium( H-1), Deuterium(H-2) and Tritium( H-3).
Carbon has C-12, C-13 And C-14.
Atoms combine in ratios to form compounds.
Atoms can neither be created nor destroyed. Latest discoveries proved that new elements can be created by nuclear reactions.
Thomson’s atomic model