All the atoms of a specific element have the same ID number.
Example: Iron is an element with the atomic number of 26, thus every atom of iron has the same atomic atomic number of 26.
The atomic number of an element is equal to the number of protons in the element’s atoms.
All the atoms of a specific element have the same number of protons.
The number of protons in an atom is equal to the atomic number of the element.
Example: The atomic number of iron is 26, which is the number of protons in each iron atom.
The list of elements compares the atomic number and protons for three elements, iron, hydrogen and helium. Notice that the atomic numbers are different and that the protons for each element is equal to the elements atomic number.
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