a) In the gold foil experiment, what observations led Rutherford to conclude that (5)
(i) Most of the space inside the atom is hollow.
(ii) The central portion of the atom is positively charged.
(iii) Volume occupied by the nucleus is very small as compared to the total volume of the atom.
(iv) Almost the entire mass of the atom concentrated at its centre.
(b) If bromine atom is available in the form of two isotopes 7935Br (49.7%) and 8135Br(50.3%), calculate the average atomic mass of bromine atom.
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Rutherford observe that (1) most of the alpha particles move straight(2)some alpha particles deflected from there path(3)12000 alpha particles out of 1 rays are rebound
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