Periodic Mole
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Periodic Table

Tap any element to see how it bonds, where you meet it in the games, and the concept pages that explain it.

Alkali metal6
Alkaline earth metal6
Transition metal38
Post-transition metal11
Metalloid7
Nonmetal7
Halogen6
Noble gas7
Lanthanide15
Actinide15

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Noble gas

Group 18. Full shell — almost completely unreactive. Found uncombined in nature.

Worth knowing

  • Stable (or duet for He) explains the lack of reactivity.
  • Argon makes up ~1% of the atmosphere; helium and neon are used in cryogenics and lighting.
  • Heavier ones (Kr, Xe) can form compounds with fluorine and oxygen under extreme conditions.

Examples

HeNeArKrXe

Behind the name

The Periodic Table

Mendeleev's pattern that lets a chemist predict an unknown element from its neighbors. Read the lore →

The Mole

6.022 × 10²³ of anything. The counting unit that bridges atoms and grams. Read the lore →