# How many electrons are present in 1^2H ,2He and He^+? Which of these are hydrogen-like species? ​

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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.]