![]() ![]() This indicates that the smallest unit capable of independent existence is not an atom, but a group of atoms. For example, hydrogen, nitrogen, oxygen gases exist in nature as group of two atoms. Atoms of the same or different types have a strong tendency to combine together to form a new group of atoms.Cornell University Press, Ithaca, New York, 1966. ![]() (vi) The relative number and kinds of atoms are constant in a given compound. The Man Who Made the Atomic Theory Usable: John Dalton and the Atom. (v) Atoms combine in the ratio of small whole numbers to form compounds. (iv) Atoms of different elements have different masses and chemical properties. (iii) Atoms of a given element are identical in mass and chemical properties. (ii) Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction. (i) All matter is made of very tiny particles called atoms. ![]() The postulates of this theory may be stated as follows: When elements were excited by an electrical current.
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