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Answer:
The relative atomic mass of chlorine depends on the ratio between the abundance of these two naturally-occurring isotopes.
Explanation:
The relative atomic mass of an element is a weighted average of the atomic mass of its naturally-occurring isotopes. The relative abundance of each isotope gives its weight in this weighted average.
For these two naturally-occurring isotopes of chlorine:
- The relative atomic mass of
is approximately
daltons. The relative abundance of this isotope in nature is approximately
.
- The relative atomic mass
is approximately
daltons. The relative abundance of this isotope in nature is approximately
.
.
.
The relative abundance of is much higher than that of
. Consequently, the relative atomic mass of the element
is closer to the atomic mass of
than that of
.