If atomic mass of calcium is 40 and that of barium is 137, then the atomic mass of strontium which constitutes the triad of calcium, strontium and barium is:
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40+137/2=177/2=88.88888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888 approx.
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