Q.

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

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a

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

b

All of these isotopes have one more neutron than protons

c

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

d

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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