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Question
State its one drawback of Rutherford’s atomic model.
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Solution
Rutherford’s atomic model could not explain the stability of the atom as it is like a solar system, the sun is at the centre and the planets revolve around it, in an atom the electrons revolve around the centrally located nucleus containing protons.
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Give the following a suitable word/phrase.
Protons and neutrons present in the nucleus.
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Multiple Choice Questions
number of valence electrons present in magnesium is
Mention briefly the salient features of Dalton’s atomic theory (five points)
Tick the most appropriate answer.
In 1908, R A Millikan found the charge of an electron to be
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β-particles are actually a stream of
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- none of these
WRITE SHORT ANSWER
What do you mean by electron transition?
Compare an electron and a proton in respect of mass and charge.
If an atom ‘A’ has an atomic number of eleven, state the number of protons and electrons it contains.
