Question

Many elements have non-integral atomic masses because —; 1) Their isotopes have non-integral masses; 2) They have isotopes; 3) Their isotopes have different masses; 4) The constituents neutrons, protons and electrons combine to give fractional masses

Answer 1

Hey !!

Option (1) Their isotopes have non-integral masses.

Many elements have non-integral atomic masses because their isotopes have non-integral masses.

Good luck !!

Answer 2

Many elements have non-integral atomic masses because :

2) They have isotopes

3) Their isotopes have different masses

Because isotopes have varying masses and occur in nature in variable proportions, elements have non-integral atomic masses.

Take Chlorine for example. The ratio of $Cl^{35}$ and $Cl^{37}$ is 3:1 .

So, Average atomic mass = $\frac{35 \times 3 + 37\times 1}{3+1}= 35.5$

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