Question

question 9. which notations represent hydrogen isotopes? o ₁¹h and ₂⁴h o ₁²h and ₂⁷h o ₂¹h and ₃¹h o ₁¹h and ₁²h

Explanation:

Isotopes of an element have the same atomic number but different mass numbers. Hydrogen has an atomic number of 1. So hydrogen isotopes will have 1 as the sub - script (atomic number) and different mass numbers (sup - script).

Answer:

D. $_{1}^{1}\text{H}$ and $_{1}^{2}\text{H}$