* ELECTRONEGATIVITY

Question 1

Describe the trend in electronegativity down a group.

Answer 1

• More shells - Atom radius increases - Weaker nuclear attraction (for bonded electrons) - Electronegativity decreases

Question 2

Although the C=O bond is polar, CO₂ molecules are not polar overall. Explain why.

Answer 2

• Molecule is symmetrical - Dipoles cancel out

Question 3

Describe the trend in electronegativity across a period.

Answer 3

• Same number of shells - Atomic radius increases - More protons - Greater nuclear attraction (for bonded electrons) - Electronegativity increases