Electronegativity and Polar covalent
bonds
1. What is meant by ‘electronegativity’?
2. State and explain the trend in electronegativity as you go across a
Period
3. State and explain the trend in electronegativity as you go down a
Group
4. Why are the electronegativities of the Noble gases zero?
5. Draw a molecule of water and label the ends of the molecule that
are slightly positive and slightly negative
6. Draw a picture of a HF molecule and label the ends of the molecule
that are slightly positive and slightly negative
7. A mass spectrum of hydrogen fluoride shows a peak at 40. What
could this be due to? Why?
8. Explain why the diatomic element hydrogen is said to have a pure
covalent bond
9. Explain why a carbon-sulphur bond is said to be pure covalent
10. Explain clearly why a carbon dioxide molecule is not polar
11. A jet of which of the following molecules will bend when a charged
rod is held next to them. Explain your answer.
A
B