Question

how are the atoms of one element different from the atoms of another element?

Explanation:

Atoms of different elements have different numbers of protons in their nuclei. This is called the atomic number. For example, hydrogen has 1 proton, and helium has 2 protons. The number of protons determines the element's identity.

Answer:

Atoms of one element differ from those of another element mainly by the number of protons in their nuclei (atomic number).