STANDARD Chemistry Bohr's Model MCQ Question
A triply ionized beryllium Be³⁺ has the same orbital radius as the ground state of hydrogen. Then the quantum state n of Be³⁺ is
n = 1
n = 2
n = 3
n = 4
Correct Answer
Detailed Explanation
The radius of the nth orbit in hydrogen-like atoms is given by rₙ = a₀n²/Z. For hydrogen, Z = 1, and for Be³⁺, Z = 4. Equating the radii, we find n = 2 for Be³⁺ to have the same radius as the ground state of hydrogen.
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