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MHT CET 2026 (18 Apr, Shift 1) · Bohr Model: Orbits, Speed & Angular Momentum

Bohr Model: Orbits, Speed & Angular Momentum question from MHT CET 2026 (18 Apr, Shift 1)

Q16MHT CET 2026 · 18 APR · SHIFT 1Medium

Bohr Model: Orbits, Speed & Angular Momentum

The triply ionized beryllium (Be $^{+++}$ ) has the same electron orbital radius as that of the ground state of hydrogen. Hence, the energy state of triply ionized beryllium is (Given $Z = 4$ for beryllium)

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Answer: (c)

$r_n = \frac{n^2}{Z} a_0$
Equal to $a_0$ : $\frac{n^2}{4} = 1 \Rightarrow n = 2$
So the answer is (c) $n = 2$ .

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