Question

Many elements have fractional atomic masses. This is because:
A. Mass of atom is itself fractional
B. Atomic masses are average masses of isobars
C. Atomic masses are average masses of isotopes
D. Atomic masses are average masses of isotopes proportional to their abundance

Right answer is D.

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Answer 1

Answer:

Option D

Atomic masses are average masses of isotopes proportional to their abdundance

Answer 2

Many elements have fractional atomic masses because atomic masses are average masses of isotopes proportional to their abundance.(Option D)

• The atomic mass is an average of all of the isotopes of that particular element, here the mass of each isotope is proportional to the abundance of that particular isotope.
• Several elements have isotopes with varied atomic masses. Therefore, many elements have fractional atomic masses.
• The atomic mass of an atom solely depends upon the atomic mass of each of the isotopes. Due to the presence of the isotopes, the atomic mass is fractional.

For example, chlorine has two isotopes with atomic masses 35 and 37 and a natural abundance ratio of 3:1.  

Therefore, The weighted average atomic mass = $\frac{35*3 + 37*1}{4}$ = 35.3.

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