The Atomic Mass of astatine is 209.9871 atomic mass units (amu). The atomic mass is given for the longest lived isotope of astatine, which is astatine-210, with a half life of 8.3 hours.
The atomic mass is the mass of a molecule, atomic particle or sub-atomic particle.
Cobalt is an atomic mass of 58.93 atomic mass units
== The equation of atomic mass is protons+nuetrons== atomic mass. ===
The atomic mass unit is not a SI unit. An atomic mass unit is equal to 1/12 from the atomic mass of the isotope 12C.
Atomic number 6, atomic mass 12.
Each isotope has a different number of neutrons. Number of neutrons = Atomic mass of the astatine isotope - 85
Astatine (At) has an atomic weight of 209.9871 g/mol
The atomic number is the number of protons, so the atomic number of astatine is 85.
Atomic number becomes two units less and atomic mass four units less. Bismuth is the answer.
Bromine, because Bromine has an atomic mass of only 5.
No other name for astatine.
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The atomic number of astatine (At) is 85.The atomic weight of At is 210 grams per mole.See the Web Links to the left of this answer for a periodic table with more information about this element!
Astatine, chemical symbol At, has an atomic number of 85.
Polonium, which has an atomic number of 84, decays to astatine, which has an atomic number of 85, a negative beta particle is emitted.
Astatine is an element in the periodic table, belonging to group 7.It has an atomic number of 85.
According to Webelements, the estimated density of astatine is 6400 kg/m3.