This question supplies weighted averages.

You are watching: The atomic mass of element a is 63.6

Since the median mass of element A is 63.6 amu and the just two isotopes are 63 and also 65, 63.6 = x% * 63 + (1-x%) * 65If friend don"t want to calculate this (like me), you deserve to look in ~ the prize choices.If it to be 100% A-63, the weight would certainly be 63. Cross turn off D.If it to be 50/50, the weight would be 64. Cross off C.So because the weighted average is 63.6, friend would intend there come be more A-63 보다 A-65, therefore B is the just answer that renders sense.

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