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# Ions2

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### Ions2

1. 1. The importance of a full outer shell<br />Part 11<br />
2. 2. <ul><li>When an atom gains or loses an electron it becomes an ION.
3. 3. It now has either a positive or negative charge
4. 4. Negative if it gains an electron - Anion
5. 5. Positive if it loses an electron - Cation
6. 6. Non-metals gain electrons
7. 7. Metals lose electrons</li></li></ul><li>Working out the charge:<br />
8. 8. Oxygen has 8 protons<br />8 electrons + 2 = 10<br />16p-18e = -2<br />4p-2e = +2<br /> 8p – 10e = -2<br />
9. 9. Ion Notation<br />Na1+<br />Charge<br />(1 electron lost)<br />Chemical symbol<br />
10. 10. How many electrons? <br />Mg2+<br />p – e = charge<br />12 – e = +2<br />12 = 2 + e<br />12 – 2 = e<br /> e = 10 electrons<br />Mg2+<br />Mg has 12 electrons if neutral<br />A charge of 2+ means it has lost 2 electrons<br />12 – 2 = 10<br />OR<br />
11. 11. Let’s practice<br />Cl has 17 protons<br />7+3 = 10<br />13 – 3 = 10<br />- Charge = gain electron<br />17 + 1 = 18<br />Give the ion notation for an atom with 11 protons and 10 electrons<br />Ca2+<br />Na1+<br />P3-<br />