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unit two

Published on Nov 21, 2015

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PRESENTATION OUTLINE

Atom

the basic unit of a chemical element
Photo by Leo Reynolds

Atomic number

the number of protons in the nuclus 

atomic mass

The number of protons and neutrons  

electron cloud

The cloud on the outside of the nuclus where the electrons are
Photo by Arenamontanus

alkali metal

The first group on the table
Photo by Cyberchemist

alkaline earth metals

Second group on the table 

transition elements

the set of metallic elements

halogens

nonmetallic elements

noble gases

they are unreactive