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Which group elements are known as haloge...

Which group elements are known as halogens?

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CBSE COMPLEMENTARY MATERIAL-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -1 - MARK QUESTIONS
  1. Which pair of elements has similar properties? 13, 31, 11 & 21

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  2. Name the element which exhibit diagonal relationship with Be.

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  3. Which group elements are known as halogens?

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  4. The element with ns^2, np^5 configuration is non-metal or metal?

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  5. Define van der Waal's radius.

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  6. Write the outer shell configuration of atomic number 31.

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  7. Find the group number and period number of element having atomic numbe...

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  8. Arrange O^(2-), O^(-1) , O in decreasing radius (size).

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  9. Why do noble gases have bigger atomic size than halogens?

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  10. Why first electron gain enthalpy of sulphur is more negative then oxyg...

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  11. Write general outer electronic configuration of 4f series elements.

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  12. Write two isoelectronic species with Br (35)

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  13. Show that 4th period can have maximum 18 elements in it.

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  14. Second I.E. is always more than first I.E., why?

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  15. Electronegativity of F gt Cl gt Br gt I , why?

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  16. Arrange F and Cl in terms of increasing chemical reactivity?

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  17. Second I.E. of Na is more than second IE of Mg. Why?

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  18. I.E. for cation is more than neutral atom. Why?

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  19. Define diagonal relationship with the help of an example.

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  20. Out of O^(-) and O , which has more negative electron gain enthalpy?

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