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What are isoelectronic ions ? Account fo...

What are isoelectronic ions ? Account for the decrease in size of the following isoelectronic ions :
`O ^(2-) - gt F ^(-) gt Na ^(+) gt Mg ^(2+)`

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

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

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

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  4. Ionisation Enthalpy

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

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

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

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

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

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

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  11. The number of valence electrons in Aluminium is

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

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

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

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

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

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  17. Why are cations smaller than neutral atom?

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  18. Which of the following properties show gradual decrease with increase ...

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  19. Nitrogen has positive electron gain enthalpy whereas oxygen has negati...

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  20. Oxides formed by p-block elements may be (i) basic (ii) acidic (...

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