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For elements with no stable isotopes, the mass number of the isotope with the longest half-life is in parentheses.

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9y ago

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Atomic mass of an atom is called?

What do you mean? Atomic mass of an atom is the weighted average mass of all the naturally occurring isotopes of that element, measured in amu (=atomic mass unit). I do not know how do you want to call it, it is just atomic mass, average atomic mass, mass of an atom, atom's mass...


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 mass of thallium?

I assume you mean the atomic mass. Its atomic mass is 204.3833g/mol


What is the atomic mass of element f?

The atomic mass of an element is the weighted average mass of its isotopes. To determine the atomic mass of element F, you would need to know the abundance of each isotope and its individual atomic mass, and then calculate the weighted average based on those values.


What is beryllium mass number?

Beryllium Atomic number: 4 Atomic Mass: 9.012


What does 22.99 mean in element Na 11?

22.99 is the atomic mass of sodium (Na). It represents the average mass of a sodium atom, taking into account the presence of different isotopes. The number 11 refers to the atomic number of sodium, indicating that it has 11 protons in its nucleus.


Does atomic number and atomic mass mean the same thing?

atomic mass and mass number are differernt because atomic mass mean mass of whole atom which mean mass of proton,neutron and electron while mass number is number of proton and neutron only.zahid ullah paf college risalpur


What does the word weighted mean in the definition of relative atomic mass?

In the definition of relative atomic mass, the term "weighted" refers to the consideration of the abundance of each isotope of an element when calculating its average atomic mass. Instead of simply averaging the masses of all isotopes, the relative atomic mass is determined by multiplying the mass of each isotope by its relative abundance, then summing these values and dividing by the total abundance. This ensures that isotopes that are more prevalent in nature have a greater influence on the final average atomic mass.


What deos atomic mass mean?

After the IUPAC rules, Atomic Mass is an expression used only for the mass of isotopes (in atomic mass units).


What do you mean by the atomic mass of an atom?

That's the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.


How do you find the atomic mass of C7H8?

You mean molecular mass or moler mass, not atomic mass! Add up the atomic masses of all the atoms in the molecule.


What is the atomic mass of technetium?

I assume you mean the atomic mass. Its atomic mass is 98.91g/mol