The importance of a full outer shell Part 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 negat...
Working out the charge:
16p-18e = -2 Oxygen has 8 protons 8 electrons + 2 = 10    8p – 10e = -2 4p-2e = +2
Ion Notation <ul><li>Na 1+ </li></ul>Chemical symbol Charge (1 electron lost)
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...
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 notat...
Upcoming SlideShare
Loading in …5
×

Ions2

549 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
549
On SlideShare
0
From Embeds
0
Number of Embeds
23
Actions
Shares
0
Downloads
2
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

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+

×