Give reasons:
Q. Give reasons:
(a) Mass number of an atom excludes the mass of an electron.
(b) Nucleus of an atom is charged.
(c) Alpha particle scattering experiment was possible by using gold foil only and not by foil of any other metal.
Ans. (a) Electrons have negligible mass or mass of an atom is practically due to protons and neutrons present in the nucleus.
(b) As it consists of positively charged protons.
(c) Because gold foil was about 1000 atoms thick.
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