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Solution


Q.

For which one of the following, Bohr model is not valid                [2020]
1 Hydrogen atom  
2 Singly ionised helium atom (He+)  
3 Deuteron atom  
4 Singly ionised neon atom (Ne+)  

Ans.

(4)

Bohr’s atomic model is valid for single electron species only. A singly ionised neon contains more than one electron. Hence option (4) is correct.