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unit two

Published on Nov 21, 2015

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PRESENTATION OUTLINE

1.

Atom

the basic unit of a chemical element
Photo by Leo Reynolds
2.

Atomic number

the number of protons in the nuclus 
3.

atomic mass

The number of protons and neutrons  
4.

electron cloud

The cloud on the outside of the nuclus where the electrons are
Photo by Arenamontanus
5.

alkali metal

The first group on the table
Photo by Cyberchemist
6.

alkaline earth metals

Second group on the table 
7.

transition elements

the set of metallic elements
8.

halogens

nonmetallic elements
9.

noble gases

they are unreactive 

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