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In the modern periodic table calcium (at...

In the modern periodic table calcium (atomic number 20) is surrounded by elements with atomic numbers 12,19,21 and 38. Which of these physical and chemical properties resembling calcium?

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For answer, consult N.C.E.R.T. End Exercise (Q. 9).
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DINESH PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-Short Ansewer Questions
  1. Examine elements of the third period : Na, Mg, Al, Si, P, S, Cl, Ar an...

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

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

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  4. The elements of group eighteen of the periodic table are given (i) T...

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

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  6. Na, Mg and Al are the elements having one, two and three valence elect...

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

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

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

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

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

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  12. Two elements X and Y have atomic number 12 and 17 respectively. (i) ...

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  13. Calcium forms the following salts : Calcium oxide -CaO, Calcium hydr...

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  14. The atomic number of K and Ca is 19 and 20 respectively and they belon...

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  15. Lithium, sodium and potassium are placed in the same group on the basi...

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  16. (a) Name metals among first five elements of the Modern Periodic Table...

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  17. As we move across a period in the periodic table, what is the gradatio...

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  18. How does the tendency of the elements to lose electrons change in the ...

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  19. An element 'X' belongs to 3^(rd) period and group 16 of the Modern, Pe...

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  20. Three elements 'X', 'Y' and 'Z' have atomic numbers 7, 8 and 9 respect...

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