For the following statements, write T for True and F for False. J.J. Thomson proposed that the nucleus of an atom contains only nucleons. A neutron is formed by an electron and a proton combining together. Therefore, it is neutral. The mass of an electron is about 1/2000 times that of proton. An isotope of iodine is used for making tincture iodine,which is used as a medicine. Put tick (ü) against correct choice and cross (×) against wrong choice in questions 15, 16 and 17
