1. Subatomic Particles and the Periodic Table

2. The Periodic Table Each “tile” of the table tells us a lot about the element. For example let’s take silver:

3. A closer look… Nitrogen 7 Protons Atomic #7 7 Electrons Symbol 7 Protons & 7 Neutrons 14 particles in the Nucleus Mass Number= 14

4. This can also be written in mass notation…. N 14 7 Write the Symbol Write the Mass Write the Atomic #

5. These all represent nitrogen N 14 7

6. Quiz… so far. What is…… Mass number? Atomic Number? How many…. Protons? Electrons? Neutrons? 7 amu 3 4 Click for answers

7. Quiz… so far II. What is…… Atomic mass? Atomic Number? How many…. Protons? Electrons? Neutrons? 35 amu 17 18 Click for answers

8. So now you have the basics but… IONS These atoms are now called Under certain situations an atom may gain or lose electrons

9. So now you have the basics but… Loses e - = positive ion cation If an atom loses electrons the overall charge of the ion will be positive

10. So now you have the basics but… Gains e - = negative ion anion If an atom gains electrons the overall charge of the ion will be negative

11. Ions can be written in mass notation…. Cl 35 17 Write the Symbol Write the Mass Write the Atomic # For example, lets look at Chlorine. Chlorine can gain 1 electron. Which makes the ion have a negative 1 charge Write the charge

12. Ions can be written in mass notation…. Mg 24 12 Write the Symbol Write the Mass Write the Atomic # For another example, lets look at Magnesium. Magnesium can lose two electrons. Which makes the ion have a positive 2 charge Write the charge +2

13. Quiz… so far III. Potassium can lose an electron What is…. The charge? Write this ion in mass notation. +1 Click for answersClick to continue K 39 19 +1