Fill in the blanks:
$(i)$ For the discovery of neutrons,$\alpha$-particles were bombarded on a thin sheet of ......... .
$(ii)$ For the $\alpha$-particle scattering experiment,Rutherford used a gold foil of thickness ......... .
$(iii)$ The radius of an atom is approximately ......... and the radius of the nucleus is ......... .
$(iv)$ The entire positive charge of an atom is concentrated in a very small region,which is called ......... .

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(N/A) $(i)$ Beryllium
$(ii)$ $100 \ nm$
$(iii)$ $10^{-10} \ m, 10^{-15} \ m$
$(iv)$ Nucleus

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