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The atomic weight of an element is the average of the Atomic Mass of each individual isotope of that element, weighted by the natural abundance of each isotope.
In other words, as an example, if we had an element called "X" that had two isotopes, with mass 10 and 20, and each isotope had the same abundance, then the atomic weight of X would be 15 (that is (10+20)/2 = 15). But if the same element X had the same two isotopes, but now the abundance of the lighter isotope was 90% and the abundance of the heavier isotope was only 10%, then the atomic weight would be much less due to the difference in abundance; that is you would not take a weighted average: 0.9*10 + 0.1*20 = 11.
See the Web Link to the left for a chart of all the isotopes of the elements, their individual masses, and their natural abundances. It is with such a chart that the actual atomic weights are calculated.
Wiki User
∙ 16y ago
Wiki User
∙ 14y agobased on the isotopes and the percentage of existence in the universe, all the masses get calculated and the atomic mass is calculated. it is good to watch out that atomic mass number is different than the atomic number.
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What is the difference between atomic mass and atomic mass unit?
The atomic mass unit is used to express the measure of the atomic mass.
What is the atomic mass of magnessium?
The atomic mass of magnesium is approximately 24.305 atomic mass units (amu).
The atomic mass of iodine is less than the atomic mass?
The atomic mass of iodine is less than the atomic mass of all elements with greater atomic number.
What is the atomic mass of magnesium?
The Atomic Mass of Magnesium is 24, the RAM (relative atomic mass) is 24.305.
What is the atomic mass of aluminium hyroxide?
The atomic mass of hydroxide (rounding) is 17.008 atomic mass of oxygen 16.00 + atomic mass of hydrogen 1.008
How is average weight of atomic mass computed?
the average atomic mass is computed by summing all isotopic weights of the isotopes of that element and then dividing this by the the total number of isotopes of that element (note that isotopic mass is exactly the same as atomic weight, except for isotopes).
What is bigger the atomic mass or atomic number?
Atomic no.=no. of protons Atomic mass=no. of protons+no. of neutrons Hence, atomic mass is greater
What is the atomic mass-?
The atomic mass is the mass of a molecule, atomic particle or sub-atomic particle.
What is the difference between atomic mass and atomic mass unit?
The atomic mass unit is used to express the measure of the atomic mass.
What is bigger atomic mass or atomic number?
Atomic no.=no. of protons Atomic Mass=no. of protons+no. of neutrons Hence, atomic mass is greater
The equation of atomic mass?
== The equation of atomic mass is protons+nuetrons== atomic mass. ===
What is the atomic mass of colbat?
Cobalt is an atomic mass of 58.93 atomic mass units
What is the atomic mass of magnessium?
The atomic mass of magnesium is approximately 24.305 atomic mass units (amu).
Is atomic mass unit a SI unit of an 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.
What is the atomic no and atomic mass of graphite?
Atomic number 6, atomic mass 12.
The atomic mass of iodine is less than the atomic mass?
The atomic mass of iodine is less than the atomic mass of all elements with greater atomic number.
What do you get when you subtract atomic number from atomic mass?
mass #-atomic#=# of neutrons
