An electron in the second orbit of a Li ion ( ) is to be ionised (removed to )

CHEMISTRY · Single correct · CBSE · Chemistry · Structure of Atom · Structure of Atom

Problem

An electron in the second orbit of a Li

^{2+}

ion (

Z = 3

) is to be ionised (removed to

n=\infty

). The wavelength of a photon that can just achieve this is closest to (a)

123\,\text{nm}

(b)

20\,\text{nm}

(c)

41\,\text{nm}

(d)

82\,\text{nm}