In what way is the Rutherford’s atomic model different from that of
Thomson’s atomic model?
Enlist the conclusions drawn by Rutherford from his α-ray scattering
experiment.
An element X has a mass number 4 and atomic number 2. Write the valency
of this element?
. Fill in the blanks in the following statements
(a) Rutherford’s α-particle scattering experiment led to the discovery of
the ———
(b) Isotopes have same ———but different———.
(c) Neon and chlorine have atomic numbers 10 and 17 respectively. Their
valencies will be———and———respectively.
(d) The electronic configuration of silicon is ———and that of sulphur
is ———.
Helium atom has 2 electrons in its valence shell but its valency is not 2,
Explain.
The atomic number of calcium and argon are 20 and 18 respectively, but
the mass number of both these elements is 40. What is the name given to
such a pair of elements?
Match the names of the Scientists given in column A with their contributions
towards the understanding of the atomic structure as given in column B
(A) (B)
(a) Ernest Rutherford (i) Indivisibility of atoms
(b) J.J.Thomson (ii) Stationary orbits
(c) Dalton (iii) Concept of nucleus
(d) Neils Bohr (iv) Discovery of electrons
(e) James Chadwick (v) Atomic number
(f) E. Goldstein (vi) Neutron
(g) Mosley (vii) Canal rays
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