Periodic classification of the elements.
(CBSE) Class X Test
1. Write
electronic configuration of C and Na. (1)
2. The atom of
an electronic configuration 2 8 8 2 belongs to which period? (1)
3. Which is
more reactive F or Cl? (1)
4. Which is
bigger in size Cl/Cl- ? (1)
5. Define the
law of Octaves? (2)
6. Why
elements of a same group show same valency? (2)
7. Discuss the
position of H atom in a periodic table. (2)
8. Differentiate
metals and non metals? (2)
9. Define
modern periodic law. (2)
10.What are metalloids?
Explain with example. (2)
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