I suppose that you think to atomic weights (not mass) of chemical elements and the molecular mass.
protons + electrons= atomic mass NUMBER, not the atomic mass.
The atomic mass is approximately the sum of the number of protons and neutrons.
Atomic number is the number of protons in an atom and atomic mass is the sum of the number of protons and neutrons.
Atomic mass or mass number.
The formula mass of a molecule or an ion is the sum of the atomic masses of all the atoms in the formula unit. This value is expressed in atomic mass units (amu) and is used to calculate the molar mass of the compound.
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.
The Atomic Mass number is the sum of the atomic number, the number of protons, and the number of neutrons in the nucleus of the 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 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.
The Atomic Mass is, basically, the sum of the protons (the "atomic number"), and the number of neutrons.
The Atomic Mass is, basically, the sum of the protons (the "atomic number"), and the number of neutrons.
The Atomic Mass is, basically, the sum of the protons (the "atomic number"), and the number of neutrons.