For and , the energies are related to the quantum no. , through an expression: ;…

CHEMISTRY · Multi-part · CBSE · Chemistry · Structure of Atom · Structure of Atom

Problem

For

\text{He}^+

and

\text{Li}^{2+}

, the energies are related to the quantum no.

n

, through an expression:

E_n = -\frac{Z^2 B}{n^2}

; where

Z

is the atomic no. of species and

B = 2.179 \times 10^{-18} \text{ J}

. (a) What is the energy of lowest level of a

\text{He}^+

ion? (b) What is the energy of III level of

\text{Li}^{2+}

ion?