MCQ
The difference between the mass number and the atomic number gives the _______.
- ANumber of neutrons.
- BNumber of electrons.
- CCharge of an element.
- DNumber of protons.
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$AB , A _2$ and $B _2$ are diatomic molecule. If the bond enthalpies of $A _2, B _2$ and $AB$ are in the ratio $1: 0.5: 1$, then the bond enthalpy of $A_2$ is $......\,kJ\,mol ^{-1}$ (Nearest integer)