The atomic number of hydrogen is 1. This means that hydrogen has one proton in its nucleus.
As for the atomic mass of hydrogen, it can vary depending on the specific isotope of hydrogen. The most common isotope of hydrogen is protium, which has a single proton and no neutrons. Its atomic mass is approximately 1.008 atomic mass units (amu). However, hydrogen also has two other isotopes: deuterium, which has one proton and one neutron (atomic mass of about 2.014 amu), and tritium, which has one proton and two neutrons (atomic mass of about 3.016 amu).
So, in summary:
- Atomic number of hydrogen: 1
- Atomic mass of hydrogen (for the most common isotope, protium): 1.008 amu