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Structure of Atom
What do you mean by absorption spectra?
If a white light from a white hot object is passed through a particular material (say sodium vapours), it is found that wavelengths of certain energies are absorbed by this material giving rise to a spectrum having black lines corresponding to these absorbed wavelengths. Such a spectrum is called absorption spectrum. Absorption spectrum may be continuous, line or band spectrum depending upon the nature of the absorbing material.
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Name the particles which determine the mass of an element.
What are α-particles?
What are the fundamental particles present in a neutral atom having atomic number greater than 1?
Do protons and neutrons have identical mass?
When α-particles are sent through a thin metal foil, most of them go straight through the foil. What inference do you draw from it?
What did Rutherford's experiment on scattering of particles show for the first time?
What is Plum-Pudding model of the atom?
Are neutrons present in all atoms?
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