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Questions On Electronegativity

C h e m g u i d e – q u e s t i o n s

ELECTRONEGATIVITY

You will need a copy of the Periodic Table.

1. Define electronegativity.

2. a) On the Pauling scale the electronegativities of nitrogen and oxygen are respectively 3.0 and 3.5.

Why is oxygen more electronegative than nitrogen?

b) On the same scale, the electronegativity of sulphur is 2.5. Why is sulphur less electronegative

than oxygen.

3. By thinking about where the following atoms are in the Periodic Table, sort them into order of

increasing electronegativity:

aluminium

barium

boron

caesium

calcium

carbon

fluorine

CsCl MgCl

NaCl PCl

SCl

a) Which of these substances has non-polar bonds? Explain your reasoning.

b) Which of these substances is the most ionic? Explain your reasoning.

c) Suggest a substance which has polar covalent bonds. Explain your reasoning.

5. Using the compounds CHCl

and CCl

as examples, explain the difference between a polar bond

and a polar compound.

Questions On Electronegativity