Periodic System for Chemists

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Noble Gases

Colorless, odorless gases in Group 18. Extremely unreactive due to complete outer electron shells.

Discovery Period: Late 19th to early 20th century (1868-2006)

Characteristics

  • • Completely filled outer shell
  • • Extremely low reactivity
  • • Colorless and odorless
  • • Low boiling points
  • • Exist as monatomic gases
  • • Used in lighting and welding

Elements (7)

2
He
Helium
10
Ne
Neon
18
Ar
Argon
36
Kr
Krypton
54
Xe
Xenon
86
Rn
Radon
118
Og
Oganesson

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