QUESTIONS

What are the evidences in favour of dual behaviour of electron?

How are the quantum numbers $\mathrm{n}, \mathrm{l}$ and ${\mathrm{m}}_{\mathrm{l}}$ arrived at? Explain the significance of these quantum numbers.

Explain the dual behaviour of matter. Discuss its significance to microscopic particles like electrons.

What are various ranges of electromagnetic radiation? Explain the characteristics of electromagnetic radiation.

Define atomic orbital. Explain the shapes of $\mathrm{s}, \mathrm{p}$ and $\mathrm{d}$ orbitals with the help of diagrams.

Explain diagrammatically the boundary surfaces for three $2\mathrm{p}$ orbitals and five $3\mathrm{d}$ orbitals.

Illustrate the reasons for the stability of completely filled and half filled subshells.

Explain emission and absorption spectra. Discuss the general description of line spectra in hydrogen atom.