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Which of the following elements is the l...

Which of the following elements is the least electronegative?

A

`S`

B

`Cl`

C

`Br`

D

`Se`

Text Solution

Verified by Experts

The correct Answer is:
D
For the respesentative elements, electro0negativity values ussually increase from left to right across periods (because of decrease of atomic size on account of increase of `Z_(eff))` and decrease from top to bottom within groups (because of increase of atomic size on account of increase in the number of shells). Thus, the order of increasing electronegativity is
`Se lt S lt Br lt CI`
`{:(2.4,2.5,2.8,3.0,):}`
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R SHARMA-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN ELEMENTS-Follow-up Test
  1. Which of the halogens has the largest negative Delta(eg)H?

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  2. Which of the group 16 elements has the least negative Delta(eg)H?

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  3. Which of the following elements has positive Delta(eg)H? (i) Mn (ii)...

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  4. Which of the following elements has negative Delta(eg)H?

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  5. Which of the following numerical scales of electrongativity (EN) uses ...

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  6. Linus Pauling, an American scientist, assigned arbitrarily a value oft...

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  7. Which of the following elements is the least electronegative?

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  8. Which of the following elements do not follow the general trends? (i...

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  9. A1through the electronegativity scale is somewhat arbitrary we can use...

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  10. Which of the following compounds contains ionic bonds?

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  11. Which of the following is the most metallic element in the periodic ta...

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  12. Which of the elements exhibit only one valency in the combined state?

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  13. For p-block elements, the normal valence (or group valence is equal to...

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  14. The oxidation number of oxygen in H(2)O(2)is

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  15. Which of the following halogens exhibits only -1 oxidation number in i...

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  16. Which of the following elements cannot from strong p(pi)-p(pi) multipl...

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  17. Which of the following hydrides have unusally high boiling points on a...

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  18. Which of the following species does not exist?

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  19. Element Be shown diagonal relationship with

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  20. Which of the following oxides are amphoteric in nature?

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