Table of Contents
Which element has a mass number of 85?
Astatine
The elements of the periodic table sorted by atomic mass
| Atomic Mass | Name chemical element | number |
|---|---|---|
| 209 | Polonium | 84 |
| 210 | Astatine | 85 |
| 222 | Radon | 86 |
| 223 | Francium | 87 |
What element has 197 mass number?
Please visit the Platinum element page for information specific to the chemical element of the periodic table.
What is the mass number of astatine?
210 u
Astatine/Atomic mass
What is astatine on the periodic table?
astatine (At), radioactive chemical element and the heaviest member of the halogen elements, or Group 17 (VIIa) of the periodic table. Astatine, which has no stable isotopes, was first synthetically produced (1940) at the University of California by American physicists Dale R.
Where can you find astatine?
Astatine can only be found on Earth following the decay of thorium and uranium. It is estimated that less than 30 g of astatine is present in the Earth’s crust, only very few µg of astatine have been produced artificially so far, and elemental astatine has not been viewed by the naked eye due to its instability.
What does the number 197 represent in the isotope gold 197?
(a) The superscript 197 is the mass number, the sum of the number of protons plus the number of neutrons. According to the list of elements given inside the front cover, gold has an atomic number of 79. Consequently, an atom of 197Au has 79 protons, 79 electrons, and 197 – 79 = 118 neutrons.
What is the mass number of gold 197?
196.966552
gold-197 (CHEBI:52454) The stable isotope of gold with relative atomic mass 196.966552, 100 atom percent natural abundance and nuclear spin 3/2.
What is the mass of a single astatine molecule At2?
Identification of Astatine Chemical Compound
| Chemical Formula | At2 |
|---|---|
| Molecular Weight | 419.974296 g/mol |
| IUPAC Name | diastatine |
| SMILES String | [At][At] |
| InChI | InChI=1S/At2/c1-2 |
What do we use astatine for?
As astatine behaves similarly as iodine, it gets secreted in the thyroid gland. Hence it is used for treating diseases related to the thyroid. The isotope called Astatine-211 is utilized in the process of radiotherapy. It is also employed in the treatment of cancer as it is known to destroy cancer-causing cells.
What is true astatine?
Astatine is a highly radioactive element and it is the heaviest known halogen. Its chemical properties are believed to be similar to those of iodine. Total world production of astatine to date is estimated to be less than a millionth of a gram, and virtually all of this has now decayed away. …