1.

The simple Bohr model is not applicable to He^(+) atom because He^(4) is an insert gas He^(4) has neutrons in the nucleus He^(4) has one more electron Electron are not subject to central forces

Answer»

Both a&b are true
Both c&d are true
Both a&c are true
Both b&d are true

SOLUTION :Bohr's atomic model isapplicable only for one electron SPECIES and in He^4 there are two ELECTRONS. Electrons are not subject to central FORCES due to longer distance than nuclear SIZE,hence verifying the answer c & d are true


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