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What is diagonal relationship? Mention t...

What is diagonal relationship? Mention two diagonally related pairs of elements.

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ICSE-THE s - BLOCK ELEMENTS-SHORT ANSWER TYPE QUESTIONS
  1. What are s-block elements ? Write their general electronic configurati...

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  2. Why does the first element of a group differ from the other elements o...

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  3. What is diagonal relationship? Mention two diagonally related pairs of...

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  4. What is the cause of diagonal relationship ? Explain with examples.

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  5. Why are group 1 elements called alkali metals ?

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  6. Why is each alkali metal atom largest in its period ?

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  7. Why do ionic radii of alkali metals increase on moving down the group ...

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  8. Why do alkali metals possess low densities?

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  9. How do the ionisation enthalpies of alkali metals vary on moving down ...

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  10. Why are the second ionisation enthalpies of group 1 elements much high...

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  11. 'Each alkali metal is the most electropositive element in its period'....

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  12. Why do alkali metals not show variable oxidation states ?

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  13. Why do alkali metals show characteristic colours in a non luminous fla...

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  14. Sodium readily formsNa^(+)ion but never forms Na^(2+) ion. Explain.

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  15. Why are the alkali metal ions colourless and diamagnetic ?

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  16. What is photoelectric effect? State t he result of photoelectric effec...

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  17. Why are potassium and caesium rather than lithium used in photoelectri...

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  18. Alkali metals are highly reactive elements. Explain, why?

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  19. What happens when alkali metals are exposed to air ?

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  20. Why are alkali metals not kept under water?

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