Give the mass and charge of an electron.
(i) The mass of an electron is about 1/1840 that of an hydrogen atom, i.e., about 9.0 x 10-31 kg.
(ii) An electron is negatively charged particle and has a charge of 1.6 x 10-19 coulomb. This is one unit of charge.
Compare the properties of electron, proton and neutron.
What are the limitations of J.J. Thomson’s model of atom?
What are the limitations of Rutherford model of the atom?
Describe Bohr's model of the atom ?
Compare all the proposed models of an atom given in this chapter.
Summarize the rules for writing of distribution of electrons in various shells for the first eighteen elements.
Define valency by taking examples of silicon and oxygen.
Explain with examples, (i) Atomic number, (ii) Mass number, (iii) Isotopes, and (iv) Isobars. Give any two uses of isotopes also.
Na+ has completely filled K and L-shells. Explain.
Mock Test Series
