1. Review from last class
What is:
An atom?
An element?
A molecule?

2. Review from last class

3. Review from last class
If this soccer ball were the nucleus of an atom, how far away would the nearest electron be?

5. Atoms are mostly empty space.
What can we conclude from this?
Atoms are mostly empty space.

7. How to read a periodic table element
Atomic number
Li Element symbol
Element name Lithium
Atomic mass

8. Name that element! (and give its atomic #)
C Copper (#6)
O Oxygen (#8)
Fe Iron (#26)
Br Bromine (#35)
Cu Copper (#29)
Pb Lead (#82)
Ag Silver (#47)

9. Give the symbol! (and give its atomic #)
Helium He (#2)
Sodium Na (#11)
Gold Au (#79)
Potassium K (#19)
Chlorine Cl (#17)
Arsenic As (#33)
Iodine I (#53)