IASOTOPES AND OUTERSHELLS AND GROUP 1 AND 7 ELEMENTS

Isotopes

atoms of the same element with the same number of protons but different number of neutrons

Relative Atomic  Mass

  (mass*abundance)+(mass*abundance)

               sum of abundance

cl-35 abundance 75% and cl-37 abundance 25%

(35*75)+(37*25)

  75+25                    =35.5

Outer shells

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