Atomic weight: the atomic weight of an chemical element, in atomic mass units or gram atomic mass Atomic mass: the atomic mass of an isotope, in atomic mass units or gram atomic mass Molecular mass: the mass of a molecule, in atomic mass units or gram molecular mass
Atomic number is the number of protons in the nucleus of an atom.Mass number is the number of protons plus neutrons in the nucleus of an atom of a specific isotope.Atomic mass is the total mass of a an atom of a particular isotope, not just the mass of the nucleus. Atomic mass is usually measured in atomic mass units (amu), and is the total mass of protons, neutrons, and electrons in an individual atom of the isotope.
The atomic mass is usually stated in grams if in any unit other than simply atomic mass units. Anything expressible in grams is also expressible in kilograms, so the answer is yes.
The atomic mass is the same as the atomic weight therefore it is 9.01218. Beryllium is a non metal element. Atomic mass of it is 9.01. The atomic mass number, which is distinct from the atomic mass and the atomic weight, is 9.
The atomic mass of mercury is 200.59 amu (atomic mass units).
Because its a synthetic element. The number that appears in brackets is the most stable isotope of technetium.
Because its a Synthetic Element!!!!!!!!
why is the atomic mass of technitium usually in brackets?
Probably because technetium does not occur naturally; all its isotopes are radioactive with short half-lives compared with naturally occurring radioactive elements such as uranium.
The standardized atomic weight of technetium is .
I assume you mean the atomic mass. Its atomic mass is 98.91g/mol
because it is an isotope???
Any time you see the atomic mass of an element in brackets on the periodic chart, that number represents the mass number of the longest-lived or best-known isotope of that element. In other words there is no stable isotope, i.e. all forms of it are radioactive.
The brackets are used for isotopic elements--those with variable numbers of neutrons. The atomic weight of the most stable isotope is the one in brackets. You know, this is a terrible way to be getting your chemistry coursework done. Here you go: www.lenntech.com/periodic-chart-elements/tc-en.htm There you go.
Technetium which has an atomic mass of 98.