atomic number 37

Noun
  1. A soft silvery metallic element of the alkali metal group;
    Burns in air and reacts violently in water;
    Occurs in carnallite and lepidolite and pollucite (synset 114677133)
    is a type of: metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
    substance meronym:
    • carnallite - a white or reddish mineral consisting of hydrous chlorides of potassium and magnesium; used as a fertilizer and as a source of potassium and magnesium
    • lepidolite - a mineral of the mica group; an important source of lithium
    • pollucite - a rare mineral that is an important source of cesium
    same as: rb, rubidium

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