The Atomic Mass listed on the Periodic Table is typically called atomic weight, and is the weighted average of the masses of all the naturally occurring isotopes of a chemical element. The term atomic weight is now controversial, and may be phased out in the future. Atomic weight is still in use partially to prevent confusion concerning the atomic masses of individual isotopes.
Average atomic mass
The atomic mass is the combined mass of the protons, neutrons and electrons in an element. It can be found below the element's symbol on the periodic table.
The atomic mass given on the periodic table is a weighted average of all the isotopes, weighted by abundance of each isotope
Few elements have isotopes. their atomic mass is not a whole number.
By Atomic Mass
Average atomic mass
Relative atomic mass, also called atomic weight, is listed on the periodic table for each element. There is no element listed on the periodic table with a relative atomic mass of 15.5.
Atomic number and atomic mass
The atomic mass is the combined mass of the protons, neutrons and electrons in an element. It can be found below the element's symbol on the periodic table.
Atomic weight, which is the mean relative mass and is dimensionless.
The atomic mass given on the periodic table is a weighted average of all the isotopes, weighted by abundance of each isotope
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Few elements have isotopes. their atomic mass is not a whole number.
The atomic mass of an element is listed on the periodic table, generally below the name of the element. The molar mass of a molecule will be generally be the sum of the atomic masses of the elements that make up the molecule.
By Atomic Mass
Xenon is listed as the 54th element on the periodic table. It is an inert gas but you will find it on the IUPAC Periodic Table as a "Noble Gas". It has an atomic mass of 131.3 grams.
Element name is listed in the center.Element atomic number on the top left.Element atomic mass on bottom left.