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Ions2

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Ions2

1. 1. The importance of a full outer shell Part 2
2. 2. <ul><li>When an atom gains or loses an electron it becomes an ION. </li></ul><ul><li>It now has either a positive or negative charge </li></ul><ul><ul><li>Negative if it gains an electron - Anion </li></ul></ul><ul><ul><li>Positive if it loses an electron - Cation </li></ul></ul><ul><li>Non-metals gain electrons </li></ul><ul><li>Metals lose electrons </li></ul>
3. 3. Working out the charge:
4. 4. 16p-18e = -2 Oxygen has 8 protons 8 electrons + 2 = 10  8p – 10e = -2 4p-2e = +2
5. 5. Ion Notation <ul><li>Na 1+ </li></ul>Chemical symbol Charge (1 electron lost)
6. 6. How many electrons? <ul><li>Mg 2+ </li></ul><ul><li>p – e = charge </li></ul><ul><li>12 – e = +2 </li></ul><ul><li>12 = 2 + e </li></ul><ul><li>12 – 2 = e </li></ul><ul><li> e = 10 electrons </li></ul><ul><li>Mg2+ </li></ul><ul><li>Mg has 12 electrons if neutral </li></ul><ul><li>A charge of 2+ means it has lost 2 electrons </li></ul><ul><li> 12 – 2 = 10 </li></ul>OR
7. 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+