From the a-particle scattering experiment, Rutherford concluded that :

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$α$ -particle can come within a distance of the order of $10^{- 14} m$ from the nucleus

the radius of the nucleus is less than $10^{- 14} m$

scattering followed Coulomb's law

the positively charged parts of the atom move with extremely high velocities

answer is A, B, C.

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Detailed Solution

From the α scattering experiment, Rutherford concluded that:
(a)There is a positively charged center in the atom called the nucleus. Nearby all the mass of an atom resides in the nucleus
(b)Electrons resolve around the nucleus in well defined orbitals.
(c)The size of nucleus is very small compared to that of an atom.
→Scattering follows columb's law
→Radius of nucleus is less than $10^{- 14} m$
→α particles can approach with an distance of the order of $10^{- 14} m$
m of the nucleus