The correct answer is option (3) 1.
The atomic mass of an element is the average mass of an atom of that element, taking into account the abundances of its isotopes and their respective masses.
For hydrogen, the approximate atomic mass (u) is 1. This value represents the average atomic mass of hydrogen atoms found in nature, considering the relative abundances of its isotopes.
Hydrogen has three isotopes: protium (¹H), deuterium (²H), and tritium (³H). The most common isotope of hydrogen is protium, which consists of a single proton and no neutrons. Deuterium, with one proton and one neutron, is less common but still naturally occurring. Tritium, with one proton and two neutrons, is radioactive and rare in nature.
The atomic mass of hydrogen is approximately 1 because the vast majority of hydrogen atoms in nature are protium, which has an atomic mass of approximately 1 atomic mass unit (u). The small contribution of deuterium and tritium to the overall average atomic mass of hydrogen does not significantly affect this value, so the approximate atomic mass of hydrogen is rounded to 1 u. |
