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Which state of a triply ionized beryllium atom has the same orbital radius as that of the ground state of hydrogen.

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Which state of a triply ionized beryllium atom has the same orbital radius as that of the ground state of hydrogen.

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The expression for the radius of hydrogen and hydrogen like atoms is given by

z = 1 for hydrogen and hydrogen like atom for ground state. Also it is given that

Thus second orbit of triply ionized beryllium atom has the same radius as the ground state of hydrogen atom.

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