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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Alkaline earth metal

Group 2 metals. Two ; reactive but less so than the alkalis.

Worth knowing

  • Lose two electrons to form +2 .
  • Magnesium and calcium are biologically essential — bones, chlorophyll, muscle contraction.
  • Burn with characteristic flame colors (Sr red, Ba green); used in fireworks and flares.

Examples

BeMgCaSrBa

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 →