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The increasing order of reactivity among...

The increasing order of reactivity among group `1` elements is `LiltNaltKltRbltCs` whereas that among group 17 elements is `FgtClgtBrgtI`. Explain.

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MODERN PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -REVISION EXERCISE (VERY SHORT ANSWER QUESTIONS (CARRYING 2 OR 3 MARKS))
  1. What are the major differences between metals and non-metals?

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  2. Write the general outer electronic configuration of s-,p-,d- and f-blo...

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  3. The increasing order of reactivity among group 1 elements is LiltNaltK...

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  4. ELECTRON GAIN ENTHALPY

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  5. How does atomic radius of an element vary across a period fr...

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  6. Statement-1: The atomic radii of the elements of the oxygen family are...

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  7. What are isoelectronic ions ? Account for the decrease in size of the ...

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  8. Ionisation Enthalpy

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  9. Fe^(2+) and Fe^(3+) can be distinguished by

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  10. Which of the following pairs of elements would have a more negative el...

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  11. Write the electronic configuration of the element with atomic number o...

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  12. What do you underrstand by negative value of electro-gain enthalpy of ...

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  13. Water is a compound and not a mixture. Justify the statement giving tw...

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  14. The number of elements in the 4th period of periodic table is

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  15. The number of valence electrons in Aluminium is

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  16. Are some essential elements more important than others? Explain.

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  17. Which has greater ionisation energy and why-S or P?

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  18. On moving from left to right in a period in the periodic table, the si...

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  19. For the second period elements the correct increasing order of first i...

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  20. Why are lanthanides and actinides place at the bottom of the periodic ...

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