State whether the following statements are true or false:
$(i)$ Faraday's electrolysis experiments and cathode ray discharge tube experiments prove that protons are located in the nucleus of the atom,while electrons are located outside the nucleus.
$(ii)$ In the year $1887$,Goldstein discovered the proton.
$(iii)$ In the year $1932$,the neutron was discovered by Chadwick.
$(iv)$ The first atomic model was proposed by Thomson.

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(A) $(i)$ False. Faraday's experiments and cathode ray tubes do not directly prove the location of protons in the nucleus; this was established by Rutherford's alpha-particle scattering experiment.
$(ii)$ False. Goldstein discovered anode rays (canal rays) in $1886$,which were later identified as protons,but the discovery is generally attributed to the $1886$ experiments.
$(iii)$ True. James Chadwick discovered the neutron in $1932$.
$(iv)$ True. $J$.$J$. Thomson proposed the first atomic model (Plum Pudding Model) in $1898$.

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Fill in the blanks given below:
$(i)$ The circular path around the nucleus in which electrons revolve at high speed is called ......... .
$(ii)$ Electrons and the nucleus are held together by ......... force.
$(iii)$ The number of $P^{+}$ in the nucleus and the sum of the number of $P^{+}$ and $n^{\circ}$ in the nucleus are represented by the symbols ...... and ......... respectively.
$(iv)$ The sum of the number of $P^{+}$ and $n^{\circ}$ in the nucleus is represented by the term ...... and the symbol .... respectively.

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