Question

for which of the following species bhors model is not valid
1) He+
2)H(g)
3)Li2+
4)H+

Answer 1

4. H+

Bohr’s model is valid **only** for hydrogen and hydrogen like species.
It’s not applicable for H+ ion.

Answer 2

$H^{+}$ Bhor’s model is not valid because it contains no electrons.  

Explanation:

This model is only suitable for an atom with only one electron. Bohr model is a formation of an atom proposed by physicist Neil Bohr in the year of 1913. It explains the properties of electrons in the atom based on the set of possible values.

In the Bohr model, the atom as a small, nucleus with an atomic number of positive charge surrounded by the same “number of electrons in orbital shells”.