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Some of the elements and their atomic nu...

Some of the elements and their atomic numbers are mentioned in the following table :

(i) How many valence electrons are there in the element 'R' ?
(ii) What is the valency of 'P' ?
(ii) Write the chemical formula of the compound formed by combining the elements ‘P' and 'Q'?
(iv) Out of the two elements 'P' and 'S', which one is larger in size ?

Text Solution

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(i) 3.
(ii) 1.
(iii) PQ.
(iv) S.
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OSWAAL PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-TOPIC:2-SHORT ANSWER TYPE QUESTIONS-I
  1. How would the tendency to lose electrons change as you go i] from le...

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  2. How does the atomic radius change as we go : (i) from left to right ...

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  3. (i) State the basis of classification of elements in the modern period...

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  4. How does metallic character of elements vary on moving from : (i) Le...

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  5. The atomic radii of three elements A, B and C of a periodic table are ...

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  6. (i) Atomic number of Mg and Al are 12 and 13, respectively. Write down...

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

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  8. Three elements X, Y and Z belong to 17^(th) group but 2^(nd),3^(rd)and...

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  9. i] Atomic radius of hydrogen is 37 pm. Express it in metres. ii] How...

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  10. Nitrogen (atomic number 7) and phosphorous (atomic number 15) belong t...

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  11. Na, Mg, Al and P belong to 3^(rd) period but are placed in first, seco...

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  12. (i) Element 'Y' with atomic number 3 combines with element 'A' with at...

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  13. (i) How does the tendency to gain electrons change as we go down the g...

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  14. Given below are atomic radii of same elements of second period. {:("...

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  15. Out of the elements X and Y, which has bigger atomic radius? Give reas...

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  16. Two elements X and Y have atomic numbers 12 and 16 respectively. To wh...

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  17. The atomic number of elements A, B, C, D and E are given below: F...

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  18. The position of three elements X, Y and Z in the periodic table are sh...

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  19. (i) An element has electronic configuration 2, 8, 6. Explain its posit...

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  20. Some of the elements and their atomic numbers are mentioned in the fol...

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