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Which of the following statements characterises isotopes of elements with less than 20 protons?

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All the stable isotopes have the same number as proton and neutrons

All of these isotopes have one more neutron than protons

These isotopes have the same number of protons, neutrons and electrons.

These isotopes have the same number of proton and electrons.

answer is C, D.

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Detailed Solution

The isotopes have same atomic number and different mass number. Thus they have same number of protons and electrons and different number of neutrons and nucleons.

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