Chemistry PYQ 5 of 152 · Structure of Atom

With reference to 'Isotopes', which of the following statements is/are correct?
1. Atoms with identical atomic numbers but different atomic mass numbers are known as isotopes.
2. Protium, Deuterium and Tritium are isotopes of carbon.
Select the correct answer from the code given below:

  1. AOnly 1
  2. BBoth 1 and 2
  3. CNeither 1 nor 2
  4. DOnly 2

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Show answer and explanation

Correct answer: (a) Only 1

Explanation

Isotopes are atoms with the same atomic number (protons) but different mass numbers (neutrons), so Statement 1 is correct.

Protium, Deuterium and Tritium are isotopes of hydrogen, not carbon, so Statement 2 is wrong.

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