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A and B have identical size and same mas...

A and B have identical size and same mass. A becomes `A^(2+)` and B becomes `B^(2 -)` . Will `A^(2+)` and `B^(2 -)` still have the same mass? Why?

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No, they will not have same mass. `B^(2-)` has more mass as, it has gained two electrons, whereas `A ^(2+ )` has lost two electrons.
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