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Enlist the conclusions drawn by Rutherford from his -ray scattering experiment.
The ratio of the radii of hydrogen atom and its nucleus is . Assuming the atom and the nucleus to be spherical.
(a) What will be the ratio of their sizes ?
(b) If atom is represented by planet earth , estimate the size of the nucleus.
Why do helium, neon and argon have a zero valency?
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 -particle scattering experiment lead 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…………..
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