The Periodic Table of the Elements. Elements: pure substances made of only 1 kind of atom Period:...

The Periodic Table of the Elements

Elements: pure substances made of only 1 kind of atomPeriod: row of elements across table every element in period has same number of

shells/orbitsGroup/Family: column of elements down table every element in same column has same # of

valence electrons (e- on outer shell) HowStuffWorks Videos "100 Greatest

Discoveries: The Periodic Table“

Important Groups

Group 1 – Alkali Metals: soft and highly reactive

Group 2 – Alkaline Earth Metals: light and reactive

Group 17 – Halogens: usually gases, very reactive

Group 18 – Noble Gases very stable, do not react

HowStuffWorks Videos "100 Greatest Discoveries: Atomic Weight“

Periodic Table: Ferocious Elements - Resources - TES Connect

The Periodic Table

Atomic Structure

all things are made of matter

all matter made of tiny particles called atoms

atoms made of 3 kinds of subatomic particles:

1. Protons (p+)

positively charged in nucleus do not move is the atomic number

2. Neutrons (n0) neutral charge in nucleus do not move p+ + n0 = atomic mass

3. Electrons (e-)

negative in orbits around nucleus can be lost, gained, or shared with other

atoms