Ions2
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Ions2 Ions2 Presentation Transcript

  • The importance of a full outer shell Part 2
    • When an atom gains or loses an electron it becomes an ION.
    • It now has either a positive or negative charge
      • Negative if it gains an electron - Anion
      • Positive if it loses an electron - Cation
    • Non-metals gain electrons
    • Metals lose electrons
  • Working out the charge:
  • 16p-18e = -2 Oxygen has 8 protons 8 electrons + 2 = 10  8p – 10e = -2 4p-2e = +2
  • Ion Notation
    • Na 1+
    Chemical symbol Charge (1 electron lost)
  • How many electrons?
    • Mg 2+
    • p – e = charge
    • 12 – e = +2
    • 12 = 2 + e
    • 12 – 2 = e
    •  e = 10 electrons
    • Mg2+
    • Mg has 12 electrons if neutral
    • A charge of 2+ means it has lost 2 electrons
    •  12 – 2 = 10
    OR
  • Let’s practice Cl has 17 protons - Charge = gain electron  17 + 1 = 18 7+3 = 10 13 – 3 = 10 Ca 2+ P 3- Give the ion notation for an atom with 11 protons and 10 electrons Na 1+