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CBSE › Class 11 › Chemistry › Classification of Elements and Periodicity in Properties
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1. Arrange S, O and Se in ascending order of electron affinity

2. In the modern periodic table , the period indicates the value of:

3. The electronic configuration of an element is 1s², 2s² 2p, 3s² 3p³. What is the atomic number of the element which is just below the above element in the periodic table

4. The reduction in atomic size with increase in atomic number is a characteristic of elements of-

5. The number of elements in the 5th period of the periodic table is

6. The electronic configuration of halogen is

7.

8. Which of the following forms the most stable gaseous negative ion?

9. On the Paulings electro negativity scale the element next to F is

10. The element californium belongs to a family of :

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