UPPCS · Question 66

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

1. ANeither 1 nor 2
2. BOnly 1
3. COnly 2
4. DBoth 1 and 2