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When α -particles are sent through a thin metal foil, most of them go straight through the foil because (one or more are correct):
(1) Alpha particles are much heavier than electrons
(2) Alpha particles are positively charged
(3) Most part of the atom is empty space
(4)Alpha particles move with high velocity
Ans: Most part of the atom is empty space
Between a proton and electron in a hydrogen atom = 3.16 x 10 47 A 0
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feature of s, p, d,f block in periodic table
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