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The atomic number of the element fluorine is 9. The isotope Fluorine-18 has a mass of 18 and fluorine-19 has a mass of 19. What is the reason for their mass differences?
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The atomic number of the element fluorine is 9. The isotope Fluorine-18 has a mass of 18 and fluorine-19 has a mass of 19. What is the reason for their mass differences?

User Vanuan
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Atomic mass is made up by the electrons protons and neutrons in an element. The reason for the mass differences are because of the varying number of electrons.

User Destinee
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