Science Struck
Science Struck: Periodic Table With Atomic Mass
Explains how Dmitri Mendeleev created the periodic table of elements, how it was organized, the changes made by Henry Moseley in 1931, some characteristics of element groups, and what the atomic mass, number, and abbreviation each...
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Us flag.org: Flag Etiquette
This website teaches how to properly treat your flag. It details what to do and what not to do with your flag. It also explains how to display the flag outdoors.