MCQ
Many elements have non-integral atomic masses because :
- AThey have isotopes
- BTheir isotopes have non-integral masses
- CTheir isotopes have different masses
- ✓The constituents neutrons, protons and electrons combine to give fractional masses
Eg. $Cl ; z =17$ and $A =35$ and $37$. They are present in the ratio $3: 1$.
$\therefore \frac{3 \times 35+1 \times 37}{4}=35.5( A )$
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$(I)\, CO_3^{-2}$ $(II)\,XeF_4$
$ (III)\,I_3^- $ $(IV)\,NCl_3$
$(V)\,BeCl_2$