Which statement best explains how the mass of an atom is organized? a) most of the mass is contained in the nucleus b) the mass is spread evenly throughout the whole atom c) the mass is spread evenly thoughout the electron cloud d) most of the mass is contained in the electron cloud

The correct answer is Option A.

Explanation:

Atomic mass is defined as the sum of number of protons and number of neutrons that are present in an atom. It is denoted by A.

A = Number of protons + Number of neutrons

Protons and neutrons are the sub-atomic particles which are present inside the nucleus of an atom.

Thus, the total mass of an atom will be comprised inside the nucleus

Hence, the correct answer is Option A.