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Bohr's theory is not applicable to which...

Bohr's theory is not applicable to which of the following species? (1) H, (2) `H^(+)`, (3) `He^(+)`, (4) `Li^(2+)`.

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Bohr's theory is not applicable to proton `(H^(+))` because it does not contain any electron.
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CHHAYA PUBLICATION-STRUCTURE OF ATOM-QUESTION ANSWER ZONE FOR BOARD EXAMINATION (VERY SHORT ANSWER TYPE)
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