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Question

A chlorine atom whose nucleus contains 17 protons and 20neutrons. Find out the composition of the nucleus of an isotope of chlorine?

A
20 protons, 17 neutrons
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B
19 protons, 18 neutrons
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C
18 protons, 18 neutrons
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D
17 protons, 19 neutrons
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E
16 protons, 20 neutrons
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Solution

The correct option is D 17 protons, 19 neutrons
Isotope nucleus means that those nucleus has same protons number but different neutrons and mass number. Since chlorine has 17 protons so its isotope also will have 17 protons. Thus, option D will correct.

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