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unit two
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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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