An element has two naturally occurring isotopes. one has an abundance of 37.40% and an isotopic mass of 184.953 amu, and the other has an abundance of 62.60% and a mass of 186.956 amu. what is the atomic weight of the element?

The atomic weight of an element depends on masses of its isotopes and their abundance.

The mass and abundance of first isotope is 184.953 amu and 37.40% respectively and that of second isotope is 186.956 amu and 62.60% respectively.

The atomic weight of element can be calculated using the following formula:

Atomic weight=% isotope-1× mass (isotope-1)+% isotope-2× mass (isotope-2)

Putting the values,

Or,

Therefore, atomic weight of the element is 186.207 amu.

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