Astatine Cube Element Sample

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Astatine's atomic number is 85 and its symbol is At. It is the rarest naturally occurring element in the Earth's crust, occurring only as the decay product of various heavier elements. All of the astatine's isotopes are short-lived; the most stable is astatine-210, with a half-life of 8.1 hours. A sample of the pure element has never been assembled, because any macroscopic specimen would be immediately vaporized by the heat of its own radioactivity.

The sample contained in this cube is uranium autunite, which is about 50% uranium by weight. It is estimated that there are approximately 5 atoms of astatine for every 1 gram of uranium via nuclear decay. Given that we put about 2 grams of uranium autunite in each cube, you should have 0-5 atoms of astatine in your model at any given moment. These atoms will theoretically only last about 2.5 seconds each.

The bulk properties of astatine are not known with certainty, but many of them have been estimated based on the element's position on the periodic table. Astatine is likely to have a dark or lustrous appearance and could be a semiconductor or possibly a metal.

Named after the Greek word astatos, meaning "unstable". Less than one gram is present in the Earth's crust at any given time. Neither the most stable isotope astatine-210, nor the medically useful astatine-211, occur naturally; they can only be produced synthetically.

This display is contained within crystal clear lucite acrylic.

  • Made In USA
  • 2x2x2 inches
  • Uranium autunite for sample.
What Sets Us Apart

Unlike many of the knock-offs found online, our element cubes contain the actual elements, which is perhaps the most important feature of the display!

Superior optical clarity, careful placement of the elements in the artwork, and real, pure elements are what set us apart. This is the highest quality and most complete element collection on the market.

We manufacture our element cubes here in the US using Lucite acrylic which does not yellow over time and is the most optically clear acrylic. This is the perfect gift for the science or chemistry lover in your life. Get yours today!


The cube is slightly radioactive but the acrylic shields most of the Alpha and Beta particles. Background radiation we are exposed to this every day is about 30CPM. These samples measure anywhere from 60 to 120 CPM. So about 2 to 4 times the background radiation. In comparison, you would receive more radiation flying on an airplane. X-rays at the doctor's office would be thousands of times this dose.  Also, a side note, the FDA allows for a person to consume about 20mg of uranium in their drinking water every year.  The bottom line is that this cube is very safe unless you were somehow able to break it open and make pistachio pudding with it. 

Discounts for Defects

We often have periodic tables, heritage museums, and other acrylic displays that have errors (usually a missing or displaced item). We sell these at a discount under the Discounted Items section of the website. Click this link to go to see these kinds of periodic tables.

Customer Reviews

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Very cool stuff