The number of electrons in the nucleus of $^{12}C$ is

The volume of the atomic nucleus is $......$ of the volume of the atom.

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.

Which of the following will not show deflection from the path on passing through an electric field?

The size of the nucleus is of the order of

The nucleus of the atom consists of