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Free CBSE - Class 9 Science - Structure of the Atom worksheets

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Here is a Sample Worksheet for you to Practice. Download this worksheet to see the answers.

1.
Which one of the following is a correct electronic configuration of sodium?
1. (a) 2,8 2. (b) 8,2,1 3. (c) 2,1,8 4. (d) 2,8,1.
2.

Complete the following table. 

Number of valence electrons in Cl ionis

3.
What are the limitations of Rutherford’s model of the atom?
4.
Describe Bohr’s model of the atom.
5.
Compare all the proposed models of an atom given in this chapter.
6.
Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.
7.
Define valency by taking examples of silicon and oxygen.
8.
Explain with examples (i) Atomic number. Give any two uses of isotopes.
9.
Explain with examples (ii) Mass number. Give any two uses of isotopes.
10.
Explain with examples (iii) Isotopes. Give any two uses of isotopes.
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