Question:medium

The radius in the hydrogen atom in the ground state is $0.53$ \AA. The radius of $Li^{+2}$ ion (atomic number $= 3$) in a similar state is \ldots..

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To quickly solve Bohr radius problems, remember that as the nuclear charge ($Z$) increases, the nucleus pulls the electron closer, making the radius smaller. Since Lithium has 3 protons ($Z=3$) compared to Hydrogen's 1, its ground state radius must be exactly one-third of Hydrogen's.
Updated On: May 12, 2026
  • $0.53 \text{\AA}$
  • $1.06 \text{\AA}$
  • $0.17 \text{\AA}$
  • $0.265 \text{\AA}$
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The Correct Option is C

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