question_answer 29)

For the following statements, write T for True and F for False. (a) J.J. Thomson proposed that the nucleus of an atom contains only nucleons. (b) A neutron is formed by an electron and a proton combining together. Therefore, it is neutral. (c) The mass of an electron is about 1/2000  times that of proton. (d) An isotope of iodine is used for making tincture iodine, which is used as a medicine.  

Answer:

(a) F: Because it was not proposed by J.J. Thomson. (b) F: Because neutron is an independent sub-atomic particle. (c) T: Because it is a fact known from experiments. (d) F: Because tincture iodine is a solution of ordinary iodine in alcohol.