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The Atomic Mass number of an element is the sum of the protons and neutrons in the nucleus of an atom of that element.

The relative Atomic Mass is the average atomic mass number of all the known isotopes of an element.

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Ardella Ernser

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3y ago

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The atomic mass of an atom is equal to the sum of numbers of what?

protons + electrons= atomic mass NUMBER, not the atomic mass.


What do atomic number and atomic mass mean?

The atomic number is equal to either the number of electrons or the protons of a particular atom. The atomic mass in a.m.u. is equal to the sum of protons and neutrons in an atom.


What number is the atomic mass equal to?

The atomic mass of an element is equal to the sum of the number of protons and neutrons in its nucleus. It is not directly related to the atomic number, which represents the number of protons in an atom.


Atomic weight is equal to the?

Atomic weight/ mass = number of protons + number of neutrons


What is the atomic mass of a atom?

The atomic mass of an atom is the total mass of protons, neutrons, and electrons in the atom, measured in atomic mass units (amu). It is approximately equal to the sum of the number of protons and neutrons in the atom's nucleus.


The number of protons in an atom is called the atomic mass of the element?

The mass number is the sum of protons and neutrons in the atomic nucleus. The number of protons is equal to the atomic number.


Which of these is always equal to the molar mass of any element?

This is sum of the atomic weights of elements contained in the formula.


Which term describes the sum of the number of protons and neutrons in an atom?

when you could check in most of atoms that we have you will see that the sum of protons and electrons equals to or is called the atomic weight or atomic mass...that is if you add protons to electrons you have your atomic mass.


Is it true that The atomic mass is equal to the atomic number?

No, the atomic mass is not equal to the atomic number. The atomic number represents the number of protons in an atom's nucleus, while the atomic mass is the sum of protons and neutrons in the nucleus. The atomic mass can differ from the atomic number, especially due to the presence of neutrons.


What two items must be equal for a nuclear equation to be balanced?

In a balanced nuclear equation, the sum of the mass numbers on the right must equal the sum on the left


Is the atomic mass equal to the number of atoms in the elements?

The mass number of an isotope of an element is equal to its atomic mass number. However, the atomic weight of an element is a weighted average of the isotopes that occur in the element in nature. Because almost all elements have more than one naturally occurring isotope (if they have any), the atomic weights of most elements are not integers, as mass numbers always are.


19protons and 20 neutrons are equal to how many atomic mass?

As electrons have such a small mass, they are not counted in the atomic mass. Thus the mass of an atom with 19 protons and 20 neutrons is 39.