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How many electrons are present in \(_1^2H\),2He and He+? Which of these are hydrogen-like species?

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Hydrogen-like species contain only one electron.

Consider \(_1^2H\) :

Number of protons = Number of electrons = 1

Consider 2He :

Number of protons = Number of electrons = 2

Consider He+ :

Number of electrons = (Number of electrons in He – 1) = 2 – 1 = 1

Thus,

\(_1^2H\) and He+ are hydrogen-like species. 

[Note : Bohr’s theory is applicable to hydrogen atom and hydrogen-like species, which contain only one electron.]

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