Noble gases: helium atomic mass 4.00 helium is a colorless, tasteless and odorless element, along with being nonflamable and lowest melting point of any element. atomic number 2. 2nd Neon atomic mass 20.17 atomic number 10.
Alkali metals atomic mass 6.94 atomic number 3. 2nd Sodium atomic number 11 atomic mass 23.00
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