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The atomic number is the same number as the number of these particles?
protons
What is 4.00260 rounded to in atomic mass?
It is 4.0026 : the atomic mass can be a fraction.
Why are most atomic masses a decimal?
The atomic mass of an isotope of an element is the mass of the nucleons (neutrons + protons) in an atom of that isotope. This is nearly, though not exactly, equal to the number of nucleons, and so is nearly a whole number.The main cause for the atomic mass being fractional is that most elements have numerous isotopes, each with a different number of neutrons and so a different atomic mass. The atomic mass for an element is the average of the atomic masses of all its isotopes, weighted together in the proportion of the isotopes' abundance on earth. It is this weighting together that results in the numbers being fractional.
What is percent abundance?
Take percent abundance times atomic mass for each isotope then add all up for average atomic mass.
Is mole percent equal to atomic percent?
No.
