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Compare the given Relative Atomic Mass (RAM) to the masses of the isotopes.
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3 stepsPart a· 3 steps
Compare the given Relative Atomic Mass (RAM) to the masses of the isotopes.
The RAM of Boron is 10.81. The isotopes are (mass 10) and (mass 11).
Determine which isotope's mass the RAM is closer to.
10.81 is closer to 11 than it is to 10.
Conclude which isotope is more abundant.
Since the average atomic mass (10.81) is closer to 11, the isotope with mass 11 must be more abundant.
The more abundant isotope is .
Part b
The relative atomic mass is a weighted average of the masses of all naturally occurring isotopes of an element. Since most elements exist as a mixture of two or more isotopes, each with a different mass number, the average mass will typically not be a whole number.
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