UPSC NDA I 2013 General Ability Paper

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Question : 76 of 150

Marks: +1, -0

Two atoms are said to be isotopes if

they have the same atomic number but different mass numbers
they have the same number of neutrons but different mass numbers
the sum of the number of protons and neutrons is the same, but the number of protons is different
they have the same number of neutrons but different modes of radioactive decay

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