An element contains 9 electrons and 10 neutrons. Find its (i)Mass number (ii)Electronic configuration (iii)Valence shell (iv)Valency
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Q2. What are the limitations of J.J. Thomson’s model of the atom?
Ans. According to J.J. Thomson’s model of an atom, the electrons are embedded all over in the positively charged spheres. But experiments done by other scientists showed that protons are present only in the centre of the atom and electrons are distributed around it.
Q3. What are the limitations of Rutherford’s model of the atom?
Ans. According to Rutherford’s model of an atom the electrons are revolving in a circular orbit around the nucleus. Any such particle that revolves would undergo acceleration and radiate energy. The revolving electron would lose its energy and finally fall into the nucleus, the atom would be highly unstable.
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