1. October 7 th

2.  Atomic Number = protons & electrons  Atomic Mass = protons + neutrons  Calculate: ▪ Neutrons = Mass – Atomic Number STAAR Tips:  APE (atomic number is the same as the amount of protons and electrons)  M&M (mass in the middle)

3.  Groups (columns)  18 groups  # of valence electrons ▪ Skip groups 3-12 for now (transition metals)  Periods (rows)  7 periods  # of energy orbitals for electrons

4.  Non-metals  All gases at room temperature  All of their outer most energy levels have something in common  Discover during our upcoming lab!  EXTREMELY UNREACTIVE! MOST STABLE!  Remember: helium is used in birthday balloons

5.  This group is MOST REACTIVE  They have something in common in their outermost energy level

6.  Metals  Most abundant If you have an unknown element, how do you know you have a metal? ShinyMagneticGood Conductor MalleableDuctile

7.  Non-Metals  Organic Elements (SPONCH) here: ▪ Sulfur ▪ Phosphorus ▪ Oxygen ▪ Nitrogen ▪ Carbon ▪ Hydrogen

8. If you have an unknown element, how do you know you have a non-metal? DullBrittleNot a good conductor Not magneticNot ductile Insulators

9.  Metalloid  Least abundant  On the “stair case” If you have an unknown element, how do you know you have a metalloid? These have properties of BOTH metals and non- metals!