Revise Isotopes

Screen Shot 2015-12-12 at 17.58.56
Screen Shot 2015-12-12 at 17.59.40 This isotope of chlorine has an atomic mass of 35 amu.

All chlorine atoms contain 17 protons, so this atom must contain 18 neutrons.
Screen Shot 2015-12-12 at 17.59.48 This isotope of chlorine has an atomic mass of 37 amu.

All chlorine atoms contain 17 protons, so this atom must contain 20 neutrons.
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