All atoms of the same element have the same atomic weight, which is determined by the number of protons and neutrons in the atom's nucleus. For example, all iron atoms have the same atomic weight, and all carbon atoms have the same atomic weight. However, the atomic weights of different elements vary, so the weight of an iron atom will be different from the weight of a carbon atom.
When comparing atoms of different elements, their atomic weights can vary significantly due to differences in the number of protons, neutrons, and electrons. In general, atoms of heavier elements will have greater atomic weights than atoms of lighter elements. For example, iron atoms are generally heavier than carbon atoms because iron has a greater atomic weight than carbon.
It's important to note that when we talk about the weight of individual atoms, we usually refer to their atomic mass or atomic weight, which is expressed in atomic mass units (amu) or grams per mole (g/mol). The weight of a single atom is incredibly small and is typically not used as a practical unit of measurement in everyday situations.