1. astatine

noun. a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium.


  • element
  • atomic number 85
  • chemical element
  • At


  • curve

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Sentences with astatine

1. Noun, singular or mass
At present, it is not necessary to remember a fifth halogen called astatine.

2. Verb, base form
To find metals on the periodic table, look at the ladder created from boron to astatine.

3. Adjective
The six non-metallic elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (As) and tennessine (Ts).