Which of the following is/are same in isotopes?
I. Mass number
II. Atomic number
III. Arrangement of orbital electrons

I only

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II only

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I and II only

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II and III only

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I, II and III only

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Solution

The correct option is C II and III only
Isotopes are atoms of same element having same atomic number and different mass number.
They have same number of electrons and same number of protons but different number of neutrons.
Hence, the option (D) II and III only, is the correct answer.

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