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
Elements On the Periodic Table When broken down you only get smaller pieces of the element Can not be chemically separated, pure substance
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