Assertion (A): A triply ionised Be-atom has the same radius of 2 nd orbit as that of ground stat...

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Assertion (A): A triply ionised Be-atom has the same radius of 2 nd orbit as that of ground state of \( \mathrm{H} \)-atom.
Reason (R): The radius of an orbit is \( r_{n}=\frac{r_{1} \times n^{2}}{Z} \).
(A) Both A and R are true and R is the correct explanation of A.br(B) Both A and R are true, but R is not the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, but R is true.
(E) Both A and R are false.
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