The atomic number is the number of protons in the atom (this can never change). The mass number is the number of protons plus the number of neutrons, this varies because atoms lose neutrons so they take one mole (6.0223x10^23) of the atoms, and average it.
Animals are not atoms and have neither an atomic number nor an atomic mass.
Atomic number and atomic mass are not alike. Atomic number is the number of protons in the nuclei of the atoms of an element. Each element has a unique atomic number. Atomic mass is the combined masses of the protons, neutrons, and electrons of the atoms of an element. Individual isotopes of an element have specific mass numbers, which are the sum of the protons and neutrons in the nuclei of the atoms of the isotope.
Atomic Number: Protons Mass Number: Protons + Neutrons
Atomic Mass minus atomic number
atoms and atomic structure
it represents where the atoms, protons, Atomic Mass, atomic number, and electrons where they are located on the nucleus.
Atoms atomic number represents their number of protons.
Atomic number is the number of protons in the nuclei of the atoms of an element. Each element has a unique atomic number. Mass number is the number of protons and neutrons in the nuclei of the atoms of a specific isotope of an element.
Atoms of the same element have different isotopes, differing only in number of neutrons (so differing in mass number, atomic mass).
Atomic number is the number of protons in the nuclei of the atoms of an element. Atomic number is unique to each element. Atomic Mass is the combined mass of the protons, neutrons, and electrons in an atom of an element.
The atomic number of an element is the number of protons in the nuclei of its atoms. Mass number is the sum of protons and neutrons in the atomic nucleus of a particular isotope of an element.
If you mean "how does one determine an atoms atomic mass?", then the answer would be to find a periodic table of elements where the whole numbers indicate atomic number and the other indicating atomic mass. Atomic number is generally described as the number of protons in a naturally occurring atom of a given element, and the atomic mass is the number of protons + number of neutrons in an atom.