For the following statements, write T for True and F for False.
(i) J.J. Thomson's proposed that the nucleus of an atom contains only nucleons.
(ii) A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.
(iii) The.mass of an electron is about 1/2000 times that of proton.
(iv) An isotope of iodine is used for making . tincture of iodine, which is used as a medicine.