Atomic Mass Websites
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Chemical Elements.com - An Interactive Periodic Table of the Elements
An up-to-date periodic table with detailed but easy to understand information
161,164 
$ 77,400.00
Periodic Table of Elements - Elements Database
Periodic table of elements with information on chemical elements like gold, silver, iron, neon, helium, chlorine, copper, cobalt, and more
8,581,659 $ 240.00