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  • Science
    • Biology
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      • Balancing Chemical Equations
      • Covalent Bonds
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      • Excited Electrons
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      • Lewis Dot Structures
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Unit 6: What Am I Consuming
6.2: Periodic Table Trends

There are multiple trends on the periodic table, but we are going to discuss four of the trends which are the following: atomic radius, electron affinity, electronegativity and ionization energy.
  • Electron affinity is the change in energy of a neutral atom when an electron is added to the atom. The electron affinity of elements decreases from top to bottom in a group, and increases from left to right in a period.
  • The atomic radius is essentially how large an atom is. The atomic radius of atoms increases from top to bottom in a group, and decreases from left to right in a period. Also, we can look at the atomic radius for ions as well. Cations are smaller than the neutral atom and anions are larger than the neutral atom.
  • The electronegativity is how strongly an atom pulls electrons to itself. Think of electronegativity as "greediness." How "greedy" an atom is for electrons. For example, Fluorine is the most greedy element and Cesium is the least greedy element. The electronegativity of elements decreases from top to bottom in a group, and increases from left to right in a period.
  • The ionization energy is the energy required to pull an electron away from an atom. The higher the ionization energy the more energy to pull an electron away from the atom. The ionization energy of elements decreases from top to bottom in a group, and increases from left to right in a period.
Watch the following video to learn more about these four trends:
https://youtu.be/G3qbooMh6Fc
Picture
Mirek2, CC0, via Wikimedia Commons
Copyright © August 2020 Melissa Wells
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  • Home
  • Tips and Tricks Blog
  • Science
    • Biology
      • Natural Selection
    • Chemistry
      • Balancing Chemical Equations
      • Covalent Bonds
      • Energy Diagrams
      • Excited Electrons
      • Flame Test
      • Fusion and Fission
      • Half-Life
      • Heat Transfer
      • Intermolecular Forces
      • Ionic Bonds
      • Isotopes
      • Lewis Dot Structures
      • Matter (Part 1)
      • Matter (Part 2)
      • Organic Chemistry
      • Periodic Table (Part 1)
      • Periodic Table (Part 2)
      • Physical Changes and Chemical Reactions
      • Radioactive Decay
      • Solutions and Separation Methods
      • The Atom
      • What is Chemistry?
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      • Good Research
      • Graphing
      • Lab Equipment
      • Lab Safety
      • Models
      • Scientific Method
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