Question

24 for what reason is atomic mass in a decimal form on the periodic table? a chemists these days have very precise instruments to measure the atomic mass b there are parts of protons and neutrons that do not add up to a whole number c it is the average relative atomic mass of all isotopes of the element d electrons have a very small amount of weight

Explanation:

Atomic mass on the periodic table is the average relative atomic mass of all isotopes of an element. Isotopes are atoms of the same element with different numbers of neutrons, and their abundances vary. The average is calculated considering these abundances, resulting in a decimal - valued atomic mass.

Answer:

C. It is the average relative atomic mass of all isotopes of the element