CBSE Class 12 Physics Notes Chapter 12 Atoms
What are Atoms?
Atoms Class 12 Notes is electrically neutral and are made up of the same amount of negative and positive charges. In Thomson’s model, atoms were described as having a spherical cloud of positive charges with embedded electrons. In Rutherford’s model, one tiny nucleus consists of most of the mass of the atom along with its positive charges and the electrons revolve around it. Rutherford’s model didn’t fulfill two explanations.
- It could not concur the stability of the matter as it predicts that atoms are unstable because of the electrons which are revolving around the nucleus might spiral into the nucleus.
- It is unable to explain the spectral characteristics of a line of atoms. Atoms of every element emit a specific characteristics spectrum and are stable. The spectrum is made of line spectrum which is an isolated parallel line.
Thomson’s model has a defect of unstable electrostatically and Rutherford’s model is electromagnetically unstable.
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