Chapter 4: Structure of the Atom

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Structure of Atom


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 frac{1}{2000} times that of proton.

(d) An isotope of iodine is used for making tincture iodine, which is used as a medicine.



(a) According to Rutherford’s model, the atom contains a nucleus at the center which is heavy and contains protons and neutrons (nucleons). But according to Thomson's model, the atoms consist of a positively charged sphere in which the electrons are embedded in it like the Christmas pudding. Hence, the given statement is False (F).

(b) The neutron is a subatomic particle that carries no charge. It is formed when beryllium is bombarded with alpha particles from the natural radioactive decay of Polonium. Hence, the given statement is False (F).

(c) The mass of proton is 1 amu. while the mass of electron is 0.0005 amu. This means that proton is 2000 times heavier than electron. Hence, the given statement is True (T).

(d) The isotope of iodine ^{127}I is the most stable isotope of iodine and is commonly used in the making of tincture. Hence, the given statement is True (T).

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