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Bohr's Model of a Hydrogen Atom

What will be ...

Question

What will be the ionisation energy of $B e^{3 +}$ ion?

A

13.6 eV

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B

54.4 eV

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C

122.4 eV

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D

217.6 eV

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Solution

The correct option is D 217.6 eV
The energy of the first Bohr orbit of a hydrogen like atom is given as
$E_{1} = - 13.6 Z^{2} e V$
For $B e^{3 +}$ , Z = 4
$∴ E_{1} = - 13.6 \times 16 e V = 217.6 e V$
So if we provide 217.6 ev $B e^{3 +}$ will ionise

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Bohr's Model of a Hydrogen Atom

Standard XII Chemistry

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