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Give the formula of one species positive...

Give the formula of one species positively charged and one negatively charged that will be isoelectronic with He.

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`Li^(+)` and `H^(-)`
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ICSE-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-VERY SHORT ANSWER TYPE QUESTIONS
  1. How many groups are present in the long form of the periodic table?

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  2. Which periods are short and which are long in the periodic table and h...

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  3. Name the orbitals which get filled in moving from left to right in fou...

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  4. what is the general electronic configuration of the elements off-block...

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  5. Which groups constitute the d- block in the periodic table ?

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  6. Define atomic radius of an atom.

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  7. Why is van der Waals' radius of an atom greater than its covalent radi...

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  8. State the following: How do the atomic radii change in a period with...

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  9. Give reasons why? The size of cation is smaller than the size of par...

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  10. Give the formula of one species positively charged and one negatively ...

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  11. Among IE(1), IE(2), IE(3) of an element, which is the largest ? Arrang...

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  12. Among s, p, d and f subshells of the same shell, which has the highest...

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  13. How does ionisation energy vary in a group in the periodic table?

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  14. Give one word or a phrase for the following statement: The energy ...

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  15. Name the elements which possess most negative values of electron gain ...

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  16. Why does LiCI have a lower M.P. than NaCl ?

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  17. Which is more basic : LiOH or NaOH ?

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  18. Which is more stable : Na(2)CO(3) or CaCO(3)?

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  19. Which of the following are not representative elements ? Li, K, Al, ...

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  20. Which is more soluble in water : CaSO(4) or SrSO(4)?

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