Firs Ionisation Energy down a Group

• What should you be able to do by the end of this video?

  Describe and explain ionization energy variation
• What does ionization energy depend on?

  Attraction between nucleus and outer electrons
• What are the three main factors affecting ionization energy?

  Atomic radius, nuclear charge, effective shielding
• How does atomic radius affect ionization energy?

  Increased radius decreases attraction to outer electrons
• What happens to the attraction between the nucleus and outer electrons as the charge on the nucleus increases?

  The attraction increases with more protons
• How does effective shielding affect ionization energy?

  More inner shells decrease attraction to outer electrons
• What trend is observed in first ionization energy down Group one?

  It decreases as you go down the group
• Why does first ionization energy decrease down a group?

  Due to increased atomic radius and shielding
• What happens to the atomic radius as you move down a group?

  The atomic radius increases
• What effect does increasing internal energy levels have on ionization energy?

  It increases shielding, decreasing ionization energy
• How does nuclear charge change as you move down a group?

  The nuclear charge increases
• Why does increased nuclear charge not prevent the decrease in ionization energy down a group?

  It is offset by increased radius and shielding
• What will the next video cover?

  Ionization energy variation across a period
• What is first ionization energy?

  The energy required to remove an electron
• Which elements are the first three in Group one?

  Lithium, sodium, potassium
• What is the outer electron shell?

  The highest energy level of electrons