The atomic mass number is always a whole number for the same reason: protons and neutrons always come in single units, not in fractions.Click to see full answer. Similarly, you may ask, why is the atomic mass not a whole number?Atomic mass is never an integer number for several reasons: The atomic mass reported on a periodic table is the weighted average of all the naturally occuring isotopes. Being an average it would be most unlikely to be a whole number. The mass of an individual atom in atomic mass units is the mass relative to carbon-12.Beside above, is an atomic number a whole number quizlet? The Atomic number is the number of protons in an atom. The mass number is found by taking the sum of all of the protons and neutrons in an atom and adding them together. What does the number represent in the isotope platinum-194? The atomic masses of elements are generally not whole numbers. Also know, is the mass number always a whole number? Mass Number. The mass number of an atom is the total number of protons plus neutrons in its nucleus. The symbol is read “uranium-238.” The mass number is always a whole number; it is a count of the particles.Why is mass number always a whole number quizlet? Terms in this set (8) Different forms of an element: same number of protons, but different number of neutrons. The sum of the protons and neutrons in the nucleus for ONE atom and is always a whole number.
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