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Sodium and aluminium have atomic numbers...

Sodium and aluminium have atomic numbers 11 and 13, respectively. They are separated by one element in the periodic table, and have valencies 1 and 3 respectively. Chlorine and potassium are also separated by one element in the periodic table (their atomic numbers being 17 and 19, respectively) and yet both have valency 1. Explain.

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ICSE-THE PERIODIC TABLE -TOPIC 2 Studying Individual Groups (5 Marks Questions)
  1. Sodium and aluminium have atomic numbers 11 and 13, respectively. They...

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  2. Name the alkali metals. How many electrons(s) do they have in their ou...

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  3. Take any one alkali metal and write its reaction with Oxygen

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  4. Take any one alkali metal and write its reaction with Water

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  5. Take any one alkali metal and write its reaction with Acid

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  6. Name or state the following with reference to the elements of the firs...

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  7. Name or state the following with reference to the element of the first...

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  8. Name or state the following with reference to the elements of the firs...

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  9. Name or state the following with reference to the elements of the firs...

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  10. Name or state the following with reference to the element of the first...

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  11. Name or state the following with reference to the elements of the firs...

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  12. Name or state the following with reference to the element of the first...

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  13. Name or state the following with reference to the elements of the firs...

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  14. Name or state the following with reference to the elements of the firs...

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  15. Name or state the following with reference to the elements of the firs...

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  16. (a)Name the first three alkaline earth metals. (b) Write their react...

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  17. The table given below shows the position of element U, V, X, Y and Z ...

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  18. The table given below shows the position of element U, V, X, Y and Z ...

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  19. In the table given below, six elements are shown with their atomic nu...

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  20. In the table given below, six elements are shown with their atomic nu...

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  21. In the table given below, six elements are shown with their atomic nu...

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