The Atomic  of an element indicates the average mass number for an atom and its isotopes and will therefore include one or more  places.

The Atomic Number of an element is equal to:AThe mass of the atom.BThe number of neutrons.CThe number of protons.DThe number of protons + neutrons.

Why is an element's atomic mass not listed as a whole number on the periodic table?A.The mass can change depending on charge.B.The mass cannot be determined very accurately.C.It represents an average mass of all isotopes.D.It represents an average mass of all ions.

What does the average atomic mass represent?A.The weighted average of the masses of the isotopes of the elementB.The sum of the molar masses of each isotope of the elementC.The best guess of what the real atomic mass of the element would beD.The average of many measurements of the mass of the element

Most of the elements exist as isotopes which are different atoms of the same element with different mass numbers and the same atomic number. Therefore, the atomic mass of an element must be its average atomic mass and it may be defined as the average relative mass of an atom of an element as compared to the mass of carbon atoms (C-12) taken as 12w.

Define the terms mass number (A), atomic number (Z) and isotopes of an element