1. its a radioactive chemical element
2. collects in the thyroid gland
3. heaviest of the discovered halogens
4. most stable isotope
The isotope astatine 211 was proposed for the radiotherapy of cancers.
It Can Be found In The Earths Crust, But In Very Small Amounts. It Can Also Be Found In Ores
If it is 'never found in nature' that means it's a large and radioactive atom so it will be in the lower parts of the periodic table. Non metals are to be found in the upper right hand side of the periodic table and become metallic roughly across a diagonal between boron and polonium. So the one you want can only be polonium, astatine or radon. Well polonium is really a metalloid rather than a true non-metal and it does occur in various radioactive rocks. When we check out radium we find that it's a nasty carcinogenic gas that occurs in nature when radium or uranium atoms decay; it's natural so we must be looking at astatine. Sure enough,Wikipedia tells us; '...a mass (of astatine) large enough to be seen (by the naked human eye) would be immediately vaporized by the heat generated by its own radioactivity'. Astatine it is! That do ya?
Astatine has 125 neutrons
Due to the fact that the amount of astatine found in a whole kilometre of the earth's crust contains less than 50 mg of astatine, no accurate price can be made due to the fact that a very small of amount of an extremely radioactive material will be hard to make.
francium plus (+) Astatine *
what is a common compound of astatine
Astatine exist in nature very probable as compounds.
astatine, element 85
Astatine is found naturally as a member of the radioactive decay series: uranium, thorium and actinium series; the chemical form is not excatly known.
Fortunately it is impossible to found astatine in your home.
astatine can be found in no everyday objects. it is only found in Uranium :)
Astatine is found less than 28 grams in the earth crust
it is produced by radioactive decay from nature
Astatine is an extremely rare chemical element, not found in common materials.
Astatine, with the symbol At and the atomic number 85, is usually classified at a metalloid, but this is in dispute. It is sometimes classified as a halogen, and possibly a metal. It is still being studied.
no, it is most commonly found as a compound
Uranium, element number 92, is the largest naturally occurring element. However, francium, 87, and astatine, 85, along with any element with an atomic number larger than 92 are not found in nature. They are produced in the laboratory. If they do occur naturally they are in exceedingly small quantities. So to answer your question "How many elements can't be found in nature?" about 16 or a few more.
Astatine is in the group 7A of the periodic table. The members of this group all have an ionic charge of -1, so At (astatine) will have a -1 ionic charge.