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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