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Na, Mg, Al and P belong to 3^(rd) period...

Na, Mg, Al and P belong to `3^(rd)` period but are placed in first, second, thirteenth and fifteenth group. Number of shells occupied in Mg is three. What is the number of occupied shells in Na, Al and P. Give reasons for your answer.

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It is three in Na, Al and P.
Elements with the same number of occupied shells are placed in same period.
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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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