What is ATOMS?

are generally described as the smallest parts of any chemical elements that can exist in a state of combination or take part in a chenJcal change. They are supposed to be indivisible, although conceivably everything, no matter how small, can be again divided into two parts. In the past it was supposed that all the atoms of any one element are of the same si/.e and weight, and that they ditfer from those of all the other elements in mass number being equal to the number of unit positive charges in the nucleus which makes them electrically neutral. The nuclei are supposed to contain the mass of the atoms although of exceedingly small dimensions, the diameter being of the ordei of o

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Definition of  ATOMS