Yes, all elements on Earth have atomic numbers. The atomic number of an element is a fundamental property that uniquely identifies it. It corresponds to the number of protons in the nucleus of an atom of that element.
Each element has a specific number of protons, and this number determines its atomic number. For example, hydrogen has an atomic number of 1 because it has one proton, while helium has an atomic number of 2 because it has two protons. This pattern continues for all elements on the periodic table.
It's worth noting that some elements may have different isotopes, which are variants of an element with the same number of protons but different numbers of neutrons. Isotopes of an element have different atomic masses but the same atomic number.