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Limitations of Bohr's Model

The simple Bo...

Question

The simple Bohr model is not applicable to $H e^{4}$ atom because

A

H e^{4}

is an inert gas.

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B

H e^{4}

has neutrons in the nucleus.

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C

H e^{4}

has one more electron.

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D

Electrons are not subject to central forces.

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Solution

The correct options are
B $H e^{4}$ has one more electron.
D Electrons are not subject to central forces.
Bohr's atomic model is applicable only for one electron species and in $H e^{4}$ there are two electrons. Electrons are not subject to central forces due to longer distance than nuclear size , hence verifies answer (c) and (d).

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Q. Match the following reactions:

$(A)$ $_{4} {B e}^{9} +_{2} {H e}^{4} \to_{6} C^{12} + \dots$	$(i)$ $_{2} {H e}^{4}$
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$(C)$ $_{7} N^{14} + \dots \to_{8} O^{17} +_{1} H^{1}$	$(i i i)$ $_{1} D^{2}$
$(D)$ $_{20} {C a}^{40} + \dots \to_{19} K^{37} +_{2} {H e}^{4}$	$(i v)$ $_{1} H^{1}$

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