EH-Astatine (Resources (mage of Astatine http://periodictable…
mage of Astatine
Astatine is a radioactive chemical element with 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. All of astatine's isotopes are short-lived; the most stable is astatine-210, with a half-life of 8.1 hours.
The first synthesis of the element was in 1940 by Dale R. Corson, Kenneth Ross MacKenzie, and Emilio G. Segrè at the University of California, Berkeley, who named it from the Greek astatos (ἄστατος), meaning "unstable".
The chemistry of astatine is "clouded by the extremely low concentrations at which astatine experiments have been conducted, and the possibility of reactions with impurities, walls and filters, or radioactivity by-products, and other unwanted nano-scale interactions."
In 1869, when Dmitri Mendeleev published his periodic table, the space under iodine was empty; after Niels Bohr established the physical basis of the classification of chemical elements, it was suggested that the fifth halogen belonged there.
What is its freezing/boiling/Melting point?
Freezing Point: 575.6°F (302°C)
Boiling point: 638.3°F (336.8°C)
Melting point :575.6°F
This is what astatine looks like
Note: This picture only has a BIT of Astatine atoms.
What State of matter is Astatine?
Although, it can turn in to more
It is a solid
What is Astatine made of?
Astatine was made by bombarding bismuth-209 with alpha particles in a cyclotron
What color is Astatine?
Darkest of black
Is Astatine an element?
It is a element
How rare is Astatine?
It is in fact the rarest element on earth
How to pronounce Astatine: (if you go to this website you can hear both US and UK.
Atomic Number: 85
Atomic Mass: (210.0) amu
Number of Protons/Electrons: 85
Number of Neutrons: 125
Date of Discovery: 1940
Discoverer: D.R. Corson
Name Origin: From the Greek word astatos (unstable)
Obtained From: Man-made
Oxidation Number: -1, +5