Period 3 and their oxides

• As you go across the period the atomic radius decreases due to the nuclear charge increasing. So there is a greater electrostatic forces of attraction between the nucleus and outer electrons
• Electronegativity increases as nuclear charge increases, atomic radius decreases and shielding stays the same. So there is a greater electrostatic forces of attraction between the nucleus and shared electrons
• Firsts ionisation energy increases as nucleaur charge increases, atomic radius decreases and shielding remains the same. So there is a greater electrostatic forces of attraction so more energy is needed to remove the outer electron
• Amphoteric

  Reacts with both acids and bases
• Lewis acid

  Lone pair acceptor
• Lewis base

  Lone pair doner
• Bronsted-Lowry acid

  Proton donor
• Bronsted-Lowry base

  Proton acceptor