1. Alkali metals Group 1 elements (except H) Have 1 valence electron
Are the most active metals
Tend to react with group 7 elements (halogens)- Why?

2. Alkaline Earth metals Group 2 elements Have 2 valence electrons
Less reactive than alkali metals but are still reactive
Tend to react with group 6 elements

3. Transition metals those families that we did not number
Metals, but different from alkali or alkaline earth metals
Most have 1 or 2 valence electrons (hard to tell)
Includes mercury (Hg) – the only liquid metal at room temperature

4. Halogens Group 7 elements
Some are gases, Br is liquid, and some are solids
Have 7 valence electrons
Tend to react with group 1 elements (alkali metals)

5. Noble gases Group 8 elements Have complete outer shells
He has 2 valence electrons (but is still full)
Ne, Ar, Kr, Xe, Rn all have 8 valence electrons

6. Noble gases
Are not reactive since they already achieved an “octet” (8 valence e-)
Contribute to less than 1% of earth’s atmosphere
O2 (21%) and N2 (78%) contribute to most of the atmosphere.

7. ***Rare-Earth Elements
includes elements at bottom of periodic table (part of periods 6 and 7)
first row = lanthanoid series- tend to be metals
second row = actinoid series – most are manmade (transuranium elements) and radioactive

8. Announcements Homework Tomorrow: Meet in B123 (Talon Room, downstairs)
Part 4 of HW Pkt
Continue working on element cards (received yesterday, top part only!)
Tomorrow: Meet in B123 (Talon Room, downstairs)
QUIZ THURSDAY
Reading the Periodic Table (atomic number, atomic mass, # p+, e-, n0, etc)
Identifying parts of atoms (nucleus, e-, p+, etc)
Describing atoms (what are they? What are they mostly made of? Etc)