In the experiment, Rutherford passes very high streams of alpha-particles from a radioactive source i.e. He conduct an experiment by bombarding alpha particles into a thin sheet of gold and then notices their interaction with the gold foil and trajectory or path followed by these particles. 19K 40, 18Ar 40, 20Ca 40, here all the elements having same mass number hence the are isobars. Isobars are the elements that have different atomic number but have same mass number. Isotopes of the Carbon atoms are 12C 6, 13C 6, 14C 6. Isotopes of the Hydrogen atoms are Protium ( 1H 1), Deuterium ( 2H 1) and Tritium( 3H 1). Isotopes are the elements that have the same atomic number but different mass. These neutrally charged particles are termed Neutrons.
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