At

Astatine · element 85

Metalloid · Solid at room temperature

Astatine is a very rare radioactive chemical element with the chemical symbol At and atomic number 85. It occurs on Earth as the decay product of various heavier elements. All its isotopes are short-lived; the most stable is astatine-210, with a half-life of 8.1 hours.

  See Astatine as a bubble   Play the Pop Quiz
This is only an illustration, not astatine itself. Crystals similar to iodine, but darker in color than these, which due to the extreme radioactivity glow blue and evaporate to dark purple gas
This is only an illustration, not astatine itself. Crystals similar to iodine, but darker in color than these, which due to the extreme radioactivity glow blue and evaporate to dark purple gas - Chemical ELements A Virtual Museum, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0> source: https://images-of-elements.com/astatine.php

Key facts

Atomic mass
210 u
how heavy one atom is
Phase (room temp.)
Solid
Density
6.35 g/cm³
how tightly packed it is
Melting point
575 K (302 °C)
when solid turns to liquid
Boiling point
610 K (337 °C)
when liquid turns to gas
Period
6
its row in the periodic table
Group
17
its column in the periodic table
Block
P-block
the neighbourhood it lives in
Electronegativity
2.2
how strongly it pulls electrons
Electron configuration
[Xe] 4f14 5d10 6s2 6p5
where its electrons live
Shells
2 · 8 · 18 · 32 · 18 · 7
electrons in each layer, inside to out
Discovered by
Dale R. Corson
who found it
Appearance
unknown, probably metallic
what it looks like

Source: Wikipedia

← PoloniumRadon →

Privacy