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No, it isn't. It is the atomic weight that is a weighted average of the mass of each of the naturally occurring isotopes of an element. The mass number, or A, is the number of protons and neutrons (the so-called nucleons) in the nucleus of an atom of an element. The atomic number, or Z, is the number of protons in the nucleus of an element.

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15y ago
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12y ago

Atomic unit mass (symbol u): 1/12 of the mass of an atom of carbon 12 in ground state and at rest (IUPAC definition).

Sometimes used synonym: Dalton (Da)

1 u = 1, 660 538 782.10-24 g

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Q: Is the mass number an average of the masses of all naturally occurring isotopes of an element?
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What is the average of all the naturally occurring isotopes of a particular element?

The average of all the naturally occurring isotopes of a particular element are an element's atomic Mass.


The average mass of all the known isotopes of an element is what?

The known weighted-averagemass of all the naturally occurring* isotopes for an element is the atomic mass of the element.____________________*This is not the same as "all the known isotopes", becausemost elements have known isotopes that are not naturally occurring.


Is the weight average mass of all the known isotopes for an element?

The known weighted-averagemass of all the naturally occurring* isotopes for an element is the atomic mass of the element.____________________*This is not the same as "all the known isotopes", becausemost elements have known isotopes that are not naturally occurring.


What is the weighted-average mass of all the known isotopes for an element?

The known weighted-averagemass of all the naturally occurring* isotopes for an element is the atomic mass of the element.____________________*This is not the same as "all the known isotopes", becausemost elements have known isotopes that are not naturally occurring.


Are the mass number is an average of the masses of all naturally occurring isotopes of an element?

Yes they do.


What is a weighted average of the masses of all of the naturally occurring isotopes of an element?

The mean Atomic Mass.


What is the weighted average of the atomic masses of an element's naturally occurring isotopes is called the?

The atomic weight that is listed on the periodic table for each element is the weighted average of the atomic masses of an element's naturally occurring isotopes. So you are describing atomic weight as it is used on the periodic table.


What is the weighted average of the masses of all naturally occurring isotopes of an element?

The atomic weight of the element (syn.: mass number).


The atomic mass of an element is defined as the weighted average mass of that element's?

For the chemical elements the correct expression is atomic weight.This value is the weighted average mass of the natural isotopes of this element.


Is radon the element naturally occurring?

The radon isotopes 222Rn and 220Rn are natural isotopes.


Is gallium a naturally occurring isotopes?

No. Gallium is an element. The element Gallium has two naturally occuring stable isotopes (69Ga and 71Ga) and abpout 29 unstable isotopes.


Is tin an isotope?

Tin is an element with ten naturally occurring isotopes.