208.980
The mass number of the only isotope of bismuth that occurs naturally is 209.
Bismuth (Bi) has an atomic mass of approximately 83.80.
The closest one is krypton, which has a mass of 83.80 according to the periodic table in my Handbook of Chemistry and Physics.
== The element bismuth has 83 protons. That's its atomic number. Remember that it's the number of protons in an element that determines the atomic number of that element. All atoms of bismuth have 83 protons. As to neutrons, the number of neutrons in bismuth atoms can vary. These other "flavors" of bismuth are its isotopes, and the numbers of neutrons in bismuth range from 101 to 135. It is bismuth-209 with 126 neutrons that represents all the natural bismuth we find. The rest of the isotopes are intentionally synthesized or created "incidentally" in nuclear reactions - like those in nuclear reactors, to cite one example. Links can be found below for more information. === ===
Bismuth is an element with the atomic number 83 and the chemical symbol Bi.
An atom that forms a covalent bond has 5 valence electrons and the highest atomic mass in its group is phosphorus (P).
Cobalt-60 has two gamma photopeaks at 1.17 MeV and 1.33 MeV. Radon-222 is an alpha emitter. Bismuth-83 is not a valid isotope. 83 is the atomic number of bismuth, but you need to know the atomic mass number. The nuclide with the longest half-life is bismuth-208, and it decays by beta+ decay.
Bismuth has an atomic radius of 156 picometers.
The atomic number of bismuth (Bi) is 83.The atomic weight of Bi is 208.98 grams per mole.See the Web Links to the left of this answer for a periodic table with more information about this element!
Bismuth
Bismuth.
Bismuth is an element of the periodic table, with the atomic number 83 and the chemical symbol Bi.