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Question Bank Nuclear Physics 1. State one difference between a chemical change and a nuclear change. Ans. A chemical change takes place due to transfer/sharing of orbital electrons of atoms of different elements, whereas nuclear change takes place due to the change in number of nucleons in the nucleus of an atom. 2. (a) What do you understand by the following terms ? (i) Nucleus, (ii) Nucleons. (b) Compare the mass and charge of nucleons of different kinds. Ans.(a) (i) The central core of the atom is called nucleus. The nucleus contains protons and neutrons. (ii) Neutrons and protons are collectively called nucleons. (b) Protons have a mass equal to 1.67 10 27 kg and charge equal to + 1.6 l0 19C. Neutrons have a slightly more mass than the protons but have no electric charge. Class-X 1 Question Bank
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