Question

astatine is a metalloid??​

Answer 1

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Answer:

Astatine is a radioactive chemical element with the symbol At and atomic number 85. It is the rarest naturally occurring element in the Earth's crust, occurring only as the decay product of various heavier elements.

Symbol: At

Atomic number: 85

Electron configuration: [Xe] 4f145d106s26p5

Atomic mass: 210 u

Melting point: 302 °C

Boiling point: 336.8 °C

Answer 2

Answer:

Astatine is a member of the halogen family, elements in Group 17 (VIIA) of the periodic table. It is one of the rarest elements in the universe. Scientists believe that no more than 25 grams exist on the Earth's surface. All isotopes of astatine are radioactive and decay into other elements. Hence it is a non-metal but also a radioactive one.