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Atomic number of few elements are given ...

Atomic number of few elements are given below 10, 20, 7, 14
(a) Identify the elements
(b) Identify the group number of these elements in the periodic table
(c) Identify the periods of these elements in the periodic table
(d) What would be the electronic configuration for each of these elements
(e) Determine the valency of these elements.

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NCERT EXEMPLAR-PERIODIC CLASSIFICATION OF ELEMENTS-Periodic Classification Of Elements
  1. Three elements A, B and C have 3,4 and 2 electrons respectively in the...

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  2. If an element X is placed in group 14, what will be the formula and th...

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  3. Compare the radii of two species X and Y. Give reasons for your answer...

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  4. Arrangement the following elements in increasing order of their atomic...

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  5. Identify and name the metal out of the following elements whose electr...

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  6. Write the formula of the product formed when the element A (atomic num...

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  7. Arrange the following elements in the increasing order of their metall...

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  8. Identify, the elements with the following property and arrange them in...

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  9. Properties of the elements are given below. Where would you locate the...

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  10. An element is placed in 2^("nd") group and 3^("rd") period of the peri...

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  11. An element X (atomic number 17) reacts with an element Y (atomic numbe...

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  12. Atomic number of few elements are given below 10, 20, 7, 14 (a) Iden...

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  13. Complete the following crossword puzzle (Figure) Across (1) An ele...

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  14. (a) In this ladder (Figure) symbols of elements are jumbled up. Rearra...

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  15. Mendeleev predicted the existence of certain elements not known at tha...

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  16. (a) Electropositive nature of the element(s) increases down the group ...

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  17. An element X which is a yellow solid at room temperature shows catenat...

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  18. An element X of group 15 exists as diatomic molecule and combines with...

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  19. Which group of elements could be placed in mendeleev's periodic table ...

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  20. Give an account of the process adopted by Mendeleev for the classifica...

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