Periodic Trends

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Periodic Trends

• The periodic table revisited

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Trends in the Periodic Table

• Atomic Size
• Ionization Energy
• Ionic Size
• Electronegativity

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Atomic Size

• As you move down a group, the atomic size
  increases
• The shielding of the nucleus by the electrons is
  greater
• The introduction of the next energy level

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Atomic Size

• As you move across a period, the atomic size
  decreases
• The energy level is the same
• The shielding is constant

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Ionization Energy

• When an atom loses or gains an electron it is an
  ion
• As you move down a group, the ionization energy
  decreases
• As you move across a period, the ionization
  energy increases

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Ionic size

• As you move down a group, the ionic size
  increases
• As you move across a period, the ionic size
  decreases for cations, increases for anions

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Electronegativity

• Electronegativity is the tendency of an atom to
  attract electrons when they are chemically
  combined with another element
• Fluorine is the most electronegative
• As you move away from Fluorine in any direction,
  the electronegativity decreases

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