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.(4)Be^(7) captures a K electron into it...

`._(4)Be^(7)` captures a K electron into its nucleus .What is the mass number and atomic number of the nuclide formed ?

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The correct Answer is:
10
When a nucleus captures a K-electron, a proton is converted to a neutron. So the mass number does not change but the atomic number reduces by `1` unit. Thus the mass number and atomic number of the resulting nuclide will be `7` and `3` respectively.
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