1. Warm Up, December 2nd, 2014
1) Which element is this? What does the 6 stand for? What might the Atomic Mass measure?
2) So far, you’ve seen random pictures of atoms. What are some differences between a Hydrogen atom and a Helium atom?

2. Element Project

3. Element*
A pure substance consisting of one type of atom.

4. Group*
A vertical column in the Periodic Table.

5. Period*
A horizontal row in the Periodic Table.

6. So what is an element?
Well, this is Carbon.

7. So what is an element?
Here’s Gold!

8. So what is an element?
And Helium!

9. So what is an element? What about Hydrogen?
"Pillars of Creation" is a photograph taken by the Hubble Telescope of elephant trunks of interstellar gas and dust in the Eagle Nebula, some 7,000 light years from Earth

10. Hydrogen’s atomic structure
So what is an element?
Hydrogen’s atomic structure
Hydrogen:
1 Proton
1 Electron
0 Neutrons

11. Helium’s atomic structure
So what is an element?
Helium’s atomic structure
Helium:
2 Protons
2 Electrons
2 Neutrons

12. Hydrogen
Helium

13. Dmitri Mendeleev The guy who made the Periodic Table
Wegener was German; Mendeleev is…?

14. Dmitri Mendeleev The guy who made the Periodic Table
The song came soon after…

15. Making a Table (How do I organize?)

16. Atomic Number* Atomic Mass* Chemical Symbol*
The number of protons in an element.
Atomic Mass*
The number of protons and neutrons in an element.
Chemical Symbol*
The uppercase (and sometimes lowercase) letters that represent an element.

17. So why is it shaped this way (weird)?
It’s because of…electrons!

18. So why is it shaped this way (weird)?

19. So each Period of the Periodic Table represents a shell of electrons…1 2 3 4 5 6 7

20. Look at your Periodic Table! Which Period is each of these elements in?

21. Valence Electrons*
The electrons that make up the outermost shell of an atom.
Elements in the first 3 periods have shell capacities of 2, 8, and 8.