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Four elements P, Q, R and S have atomic ...

Four elements P, Q, R and S have atomic numbers 12, 13, 14 and 15 respectively.
Answer the following questions giving reasons :
What is the valency of Q?

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Q has valency 3.
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SWAN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS -ADDITIONAL IMPORTANT QUESTIONS (Short Answer Type Questions)
  1. The elements Li, Na and K, each having one valence electron, are in pe...

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

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  3. Four elements P, Q, R and S have atomic numbers 12, 13, 14 and 15 resp...

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  4. Four elements P, Q, R and S have atomic numbers 12, 13, 14 and 15 resp...

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  5. Four elements P, Q, R and S have atomic numbers 12, 13, 14 and 15 resp...

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  6. The element Be, Mg, Ca are placed in the second group of the periodic ...

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  7. The element Be, Mg, Ca are placed in the second group of the periodic ...

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  8. The element Be, Mg, Ca are placed in the second group of the periodic ...

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  9. Table given below shows a part of the periodic table: Using this ...

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  10. Table given below shows a part of the periodic table: Using this ...

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  11. Table given below shows a part of the periodic table: Using this ...

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  12. Explain the following term- Sericulture

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  13. Two elements X and Y belong to group 1 and 2 - respectively in the sam...

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  14. Two elements X and Y belong to group 1 and 2 - respectively in the sam...

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  15. Two elements X and Y belong to group 1 and 2 - respectively in the sam...

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  16. Two elements X and Y belong to group 1 and 2 - respectively in the sam...

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  17. Two elements X and Y belong to group 1 and 2 - respectively in the sam...

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  18. Two elements X and Y belong to group 1 and 2 - respectively in the sam...

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  19. Lithium, sodium potassium are all metals that react with water to libe...

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  20. Explain the following term- Rearing.

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