[Answer] What determines an element’s atomic mass?

Step 1 : Introduction to the question "What determines an element’s atomic mass?"

...Because the weight of electrons is negligible, elements are organized on the periodic table by their atomic mass — the combined mass of protons and neutrons. Hydrogen, for example, has only one proton, so its atomic mass is roughly 1 u (or atomic mass unit). On the other hand, the synthetic chemical element oganesson has 118 protons and 176 neutrons — the highest atomic mass on the periodic table.

Step 2 : Answer to the question "What determines an element’s atomic mass?"

Protons and neutrons:

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