If the Bohr model is applicable to only single electron species, why does it take into consideration n=2,3,4, 5 and so on ? Because the one electron would only keep revolving in the K Shell.

Dear student,

Here, n is a shell, if we are saying that n = 2 this means we are talking about the second shell.

And it is applicable for single-electron species because it depends on the coloumbic interactions between one electron and proton. 
It cannot be extended for more than one electron containing species, however, species having the same number of electrons as the hydrogen atoms are having can be applicable for this. 

Species which are having atomic number 2, 3 and so on they must carry one electron but as protons lie inside the nucleus and we cannot able to remove those protons easily that's why those species will contain the respective protons number as what their atomic number is. And due to coloumbic interaction, we have to take protons into consideration.

Regards







 

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