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# Ions2

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### Transcript

• 1. The importance of a full outer shell Part 2
• 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
• 3. Working out the charge:
• 4. 16p-18e = -2 Oxygen has 8 protons 8 electrons + 2 = 10  8p – 10e = -2 4p-2e = +2
• 5. Ion Notation
• Na 1+
Chemical symbol Charge (1 electron lost)
• 6. 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
• 7. 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+