1. The Periodic Table of Elements
The Periodic Table is arranged by atomic number and atomic mass
Columns = groups
Rows = periods
Group 1 Alkalis = highly reactive when exposed to water it will explode ( in batteries)
Group 17= Halogens (in light bulbs)
Group 18 = Noble Gases do not react or bond with others

2. Elements On the Periodic Table Represented by a chemical symbol
When broken down you only get smaller pieces of the element
Pure substance, can not be chemically separated,

3. Atomic Structure
The subatomic particles are: Protons, Neutrons and Electrons
Protons = Positive charge (+), the number of protons gives you the element name
Neutrons = no charge (neutral)
Electrons = Negative charge (-)
Nucleus = Protons and neutrons live here
Atomic Number = number of the Protons
Atomic Mass = number of Protons plus (+) number of Neutrons