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The atomic weight (not mass) of a chemical element is the ratio between the average mass of the atoms of this element to 1/12 from the Atomic Mass of carbon-12.

The atomic mass is a term applied only to specific isotopes; the unit is the same as above. Is a value denoting the total mass of all the protons, neutrons, and electrons in an isotope.

The mass number tells us the number (the sum) of protons and neutrons in the nucleus of an atom.

The atomic number, on the other hand, tells us how many protons are in the nucleus of an atom.

IUPAC publish periodically tables of atomic weights - the last edition is from 2009-2010.

For the atomic masses of isotopes the last published edition is The AME 2003 atomic mass evaluation, edited by Audi, Wapstra and Thibault.

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The mass of all particles of an atom added together is its what?

The sum of protons and neutrons in an atom is called mass number.


What is the atomic mass of this atom 19p and 20n?

To calculate the atomic mass of an atom, you would add the number of protons and neutrons together. In this case, the atom has 19 protons and 20 neutrons, totaling 39 nucleons. The atomic mass of this atom would be approximately 39 atomic mass units (amu).


How do you get atomic mass?

Atomic mass is found by adding together the individual masses of the numbers of protons, neutrons, and electrons in the atom.--> Atomic Mass = protons + neutrons


What two particles of the atom are added together to get the atomic mass?

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How do you calculate the atomic mas based on the number of protons and neutrons of an atom?

To calculate the atomic mass of an atom, you would add the number of protons and neutrons together. Protons and neutrons each have a mass of approximately 1 atomic mass unit (amu). The sum of the protons and neutrons will give you the atomic mass of the atom in atomic mass units.


What is an atomic mass number?

Atomic mass and atomic number are two different things. Atomic mass is the mass of an atom compared to that of hydrogen. The atomic number is the atom's position in the periodic table. It's also the number of protons it has.


Does an atom of aluminum and an atom of gallium have the same atomic mass?

No, an atom of aluminum and an atom of gallium do not have the same atomic mass. Aluminum has an atomic mass of approximately 26.98 atomic mass units, while gallium has an atomic mass of approximately 69.72 atomic mass units.


What information does the atomic mass of an elemt provide?

the number of protons and neutrons in an atom. Atomic mass is found by adding together the individual masses of the numbers of protons, neutrons, and electrons in the atom. --> Atomic Mass = protons + neutrons


How do you you find the mass number of an atom?

To find the mass number of an atom, you add together the number of protons and neutrons in the nucleus of the atom. The atomic mass listed in the periodic table is the weighted average of the mass numbers of all isotopes of that element.


An atom has 11 protons and 12 neutrons Its atomic mass is?

The atomic mass of an atom with 11 protons and 12 neutrons is calculated by adding the number of protons and neutrons together. In this case, the atomic mass would be 11 (protons) + 12 (neutrons) = 23 atomic mass units.


How do you determine the atom the atomic mass of an atom?

Proton + Nuetron = Atomic Mass


What is the atomic mass of an atom?

The atomic mass of an atom is the combined mass of the protons and neutrons in the nucleus.