A laboratory source emits radiation from an unknown hydrogen-like ion

CHEMISTRY · Subjective · CBSE · Chemistry · Structure of Atom · Structure of Atom

Problem

A laboratory source emits radiation from an unknown hydrogen-like ion. The strongest visible line observed from this source has wavelength

72.9\,\text{nm}

and arises from the transition

n=3 \rightarrow n=2

. (i) Determine the atomic number

Z

of the ion. (The wavelength of the Balmer-

\alpha

line for hydrogen is

656.3\,\text{nm}

.) (ii) Using the value of

Z

obtained, compute the ionisation energy of this ion in electron-volts. (iii) Comment on whether the calculated ionisation energy matches the trend expected from the Bohr model for hydrogen-like species.

Related theory

Atomic Structure
Bohr's atomic model
Structure of Atom
Electron configurations
Bohr's Model of Atom

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