Electronegativity
Measures the tendency of an atom to attract shared electron pairs in a chemical bond and discusses its various scales and periodic trends.
What is Electronegativity?
A measure of the tendency of an atom to attract a bonding pair of electrons.
Key points
- Define electronegativity and its significance.
- Explain the factors affecting electronegativity.
- Describe the periodic trends of electronegativity.
- Differentiate between various electronegativity scales.
Common exam trap
Confusing electronegativity with electron affinity or ionization energy.
Definitions
- Term
Electronegativity
- Meaning
A measure of the tendency of an atom to attract a bonding pair of electrons.
- Term
Pauling Scale
- Meaning
A relative scale of electronegativity values, with values assigned based on bond energies.
- Term
Bond Polarity
- Meaning
The uneven distribution of electron density in a covalent bond due to differences in electronegativity between the bonded atoms.
Learning objectives
Define electronegativity and its significance.
Explain the factors affecting electronegativity.
Describe the periodic trends of electronegativity.
Differentiate between various electronegativity scales.
Predict bond polarity based on electronegativity differences.
Prerequisites
Atomic Structure
Periodic Classification of Elements
Chemical Bonding (Ionic and Covalent)
Common mistakes
Confusing electronegativity with electron affinity or ionization energy.
Assuming electronegativity is a directly measurable quantity rather than a calculated relative value.
Forgetting that electronegativity applies to bonded atoms, not isolated atoms.
Incorrectly applying periodic trends without considering exceptions.
Keywords
Electronegativity
Pauling Scale
Bond Polarity
Periodic Trends
Chemical Bonding
Nuclear Charge
Atomic Radius
Covalent Bond
Ionic Bond
Practice preview
Which of the following elements is expected to have the lowest electronegativity?…
easy
Which of the following pairs of elements will have the largest electronegativity difference?…
medium
Which of the following statements regarding the electronegativity of elements is correct?…
easy