beryllium

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The Simple English Wikipedia has an article on:

lithium 4 boron

Pronunciation[change]

Noun[change]

Singular
beryllium

Plural
none

  1. Beryllium is a light, grey metal. It has an atomic number of 4 and the symbol Be. It is the first of the alkaline earth metals.
    Beryllium is very poisonous.
    Emeralds contain beryllium.