Electronegativity

1
Topic 1.6

• Electronegativity

2

• Electronegativity is a measure of an atoms
  ability to attract electrons.
• Attracting electrons makes an atom electrically
  negative (because electrons are negatively
  charged).
• Elements which have more complete valence shells
  (the closer you get to having eight) will have
  higher electronegativity because a filled valance
  shell is most stable.

3

• nonmetals have higher electronegativity than
  metals
• nonmetals tend to form negative ions when
  forming ionic bonds.

4
Table of Electronegativity Values

• Group1 Group2 Group13 Group 15 Group
  16
• Row 2 1.0 1.5 2.0 3.0
  3.5
• Row 3 0.9 1.2 1.5 2.1
  2.5
• Row 4 0.8 1.0 1.6 2.0
  2.4
• Electronegativity increasing

5
Table of Electronegativity Values

• Group1 Group2 Group13 Group 15 Group
  16
• Row 2 1.0 1.5 2.0 3.0
  3.5
• Row 3 0.9 1.2 1.5 2.1
  2.5
• Row 4 0.8 1.0 1.6 2.0
  2.4
• Electronegativity decreasing down a group

6
The smaller the atom the higher the
electronegativity

• Electronegativity increases across a period (row)
• Electronegativity decreases down a column
• This is the opposite of the trend for size