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

`._(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:
7
In K-electron capture, a proton of nucleus changes into neutron.
`._(1)^(1)H ._(-1)^(0)e to ._(0)^(1)n`
`._(4)^(7)Be + ._(-1)^(0)e to ._(3)^(7)Li`
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