1. Isotopes: Build the Following Atoms 1 Proton 1 Electron 0 Neutrons 1 Proton 1Electron 1 Neutron 1 Proton 1 Electron 2 Neutrons 1 Proton 1 Electron 0 Neutrons 1 Proton 1Electron 1 Neutron 1 Proton 1 Electron 2 Neutrons What element(s) did you build? What do they have in common?

2. Image via Cold Fusion 1 H Hydrogen 1.00794 There are three types of hydrogen but the vast majority of hydrogen is protium. The atomic mass is a weighted average of all the types of hydrogen. So if you had a bag filled with hydrogen gas, it would have all three types but most of it would be protium.

3. Image via Cold Fusion Hydrogen-1 Hydrogen-2 Hydrogen-3 1H1H 2H2H 3H3H ISOTOPES

4. Two stable isotopes of carbon are carbon-12 and carbon-13. 12 C 6 13 C 6 We can express the isotopes of carbon using subscripts and superscripts Protons_________ Neutrons________ Electrons________ Protons_________ Neutrons________ Electrons________ YXYX Z #p + #n #p symbol

5. Ne If you had a bag full of neon gas it would contain three different stable Isotopes of Neon Ne Protons_________ Neutrons________ Electrons________ Protons_________ Neutrons________ Electrons________ Protons_________ Neutrons________ Electrons________ Neon-20 Neon-21 Neon-22 Symbol 10 Ne Neon 20.18 Weighted average of stable neon isotopes. Which isotope of neon is most abundant? Ne

6. 4.3 21 Ne 10 21 Ne 10 20 Ne 10 Image via pearson Chemistry textbook

7. Ne If you had a bag full of neon gas it would contain three different stable Isotopes of Neon Ne Protons_________ Neutrons________ Electrons________ Protons_________ Neutrons________ Electrons________ Protons_________ Neutrons________ Electrons________ Neon-20 Neon-21 Neon-22 Symbol 10 Ne Neon 20.18 Weighted average of stable neon isotopes. Which isotope of neon is most abundant? Ne

8. If you had 400 atoms of Neon: ~362 are Neon-21, ~37 are Neon-22 ~1 is Neon-21 If you had 400 atoms of Neon: ~362 are Neon-21, ~37 are Neon-22 ~1 is Neon-21 Neon-20 Neon-21 Neon-22 10 Ne Neon 20.18 Ne Neon-20 = 90.48% Neon-21 = 0.27% Neon-22 = 9.25%

10. Phet Physics Game Quiz Clicker Questions PPT Handout on Isotopes 2x Labs (Borax Slime and Borax Snowflakes)