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An element belongs to third period and s...

An element belongs to third period and second group in the periodic table.
(a) State number of valence electrons in it. (b) Is it a metal or non-metal ?
(c) Name the element (d) Write the formula of its oxide

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(a) The element belonging to third period and second group is calcium (Z = 20). Its electronic configuration is 2, 8, 8, 2
(a) It has two valence electrons (b) The element is a metal
(c) The element is calcium (Ca) (d) The formula of calcium oxide is CaO.
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DINESH PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-Short Ansewer Questions
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  3. An element belongs to third period and second group in the periodic ta...

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  4. (a) The elements of the second period along with their atomic numbers ...

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  6. Chlorine (atomic number 17) is more electronegative than sulphur (atom...

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  8. Write two reasons responsible for the late discovery of noble gases.

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  9. The positions of three elements P, Q and R in the periodic table are s...

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  10. Examine elements of the third period : Na, Mg, Al, Si, P, S, Cl, Ar an...

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  11. Two elements M and N belong to group I and II respectively and are in ...

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  12. In the modern periodic table calcium (atomic number 20) is surrounded ...

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  14. Explain the variation in the following properties of the elements in t...

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  16. Arrange the following elements in the descending order of atomic size ...

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  17. The following table shows the positions of six elements A, B, C, D, E ...

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  18. Given below are some elements of the modern periodic table : ""(4)Be...

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  19. The elements Li, Na and K, each having one valence electron, are in pe...

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  20. An element X (atomic number 17) combines with an element. Y (atomic nu...

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