give reason-
1. mass number of an atom excludes the mass of an electron
2. nucleus of an atom Is charged
3. alpha particle scattering experiment was possible by using gold foil and not by foil of any other metal
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1. because the mass of electron is very small so it cannot take part in mass number.
2. the nucleus of an atom is positively charged because due to the presence of proton
2. the nucleus of an atom is positively charged because due to the presence of proton
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