1.

What is the mass number of an element A, if `A^(4-)` contains 10 electrons and 6 neutrons? [Divide anser by 2]

Answer» `A^(-4)rArre^(-)=10` after gain of 4 electrons so in neutral atoms number of electrons=6
so number of protons=6
Mass number=number of p+ number of n
`=6+6=12`


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