Atoms, Molecules and Nuclei
Rutherford’s model of atom:
- Most of the mass of the atom and all its positive charge are concentrated in a tiny nucleus, and the electrons revolve around this nucleus.
- It predicts that atoms are unstable because the accelerated electrons revolving around the nucelus must spiral into the nucleus. This contradicts the stability of matter.
- It could not explain the characteristic line spectra of atoms of different elements.
- Total energy of electron in hydrogen atom
Origin of Spectral Lines:
- The atomic hydrogen emits a line spectrum consisting of various series. The frequency of any line in a series can be expressed as a difference of two terms:
- Lyman series:
- Balmer series:
- Paschen series:
- Bracket series:
- Pfund series:
Bohr model of hydrogen atom
In a hydrogen atom, electrons can revolve only in…
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