The mass to charge ratio $(m/e)$ of a cation is $1.5 \times 10^{-8} \ kg/C$. What is the mass of the ion?

The part of the atom excluding the outermost shell is known as the ...... .

Which of the following particles is represented by the symbol $\alpha$?

The mass of a proton is $... \ g$.

The neutron possesses:

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.