Periodic Trends and Chemical Reactivity
Correlates periodic trends in atomic properties with the chemical reactivity of elements, including metallic and non-metallic character.
What is Periodic Trends and Chemical Reactivity?
The distance from the nucleus to the outermost electron shell of an atom.
Key points
- Describe the periodic trends in atomic radius, ionization energy, and electronegativity.
- Explain the concepts of metallic and non-metallic character.
- Correlate periodic trends with the chemical reactivity of elements.
- Predict the relative reactivity of elements based on their position in the periodic table.
Common exam trap
Confusing trends across a period with trends down a group.
Definitions
- Term
Atomic Radius
- Meaning
The distance from the nucleus to the outermost electron shell of an atom.
- Term
Ionization Energy (IE)
- Meaning
The minimum energy required to remove the most loosely bound electron from an isolated gaseous atom in its ground state.
- Term
Electronegativity (EN)
- Meaning
A measure of the tendency of an atom to attract a bonding pair of electrons.
- Term
Metallic Character
- Meaning
The set of chemical properties associated with metals, including the tendency to lose electrons and form positive ions (cations).
- Term
Non-metallic Character
- Meaning
The set of chemical properties associated with non-metals, including the tendency to gain electrons and form negative ions (anions).
Learning objectives
Describe the periodic trends in atomic radius, ionization energy, and electronegativity.
Explain the concepts of metallic and non-metallic character.
Correlate periodic trends with the chemical reactivity of elements.
Predict the relative reactivity of elements based on their position in the periodic table.
Prerequisites
Atomic Structure (protons, neutrons, electrons, electron shells, subshells)
Electronic Configuration
Concept of Nuclear Charge and Shielding Effect
Basic understanding of chemical bonding
Common mistakes
Confusing trends across a period with trends down a group.
Incorrectly applying ionization energy or electronegativity trends to predict reactivity.
Overlooking exceptions to general trends.
Assuming all elements in a group have identical reactivity.
Keywords
Periodic Table
Atomic Radius
Ionization Energy
Electronegativity
Metallic Character
Non-metallic Character
Chemical Reactivity
Periodic Trends
Groups
Periods
Shielding Effect
Nuclear Charge
Practice preview
Which of the following is NOT a periodic trend in chemical properties?…
easy
As we move down a group in the periodic table, the metallic character of the elements generally:…
easy
Consider the elements Li, Be, B, C, N, O, F, Ne. Which of the following statements accurately describes a trend in their chemical reactivity?…
hard