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For example, the atomic weight of the element chlorine is 35.453, determined by averaging the atomic masses and relative abundances of its two main naturally occurring isotopes, which have atomic masses of about 35 and 37.
An atom always has the same number of protons as electrons so there are 16 electrons also. The difference between the mass number and atomic number (32 - 16) is the number of neutrons so Sulphur has 16 neutrons also. We can ignore the mass of the electrons. You next question will be about chlorine probably.