[Campbell Biology P.80] Which of the following statements correctly describes the atomic nu... | Practice Question

Which of the following statements correctly describes the atomic number and mass number of an atom?

• A: Atomic number is the sum of protons and neutrons, while mass number is the number of protons.
• B: Atomic number is unique to an element and represents the number of protons, whereas mass number represents the total number of protons and neutrons.
• C: Both atomic number and mass number are determined solely by the number of neutrons.
• D: Mass number is the average atomic mass of an element, while atomic number indicates the number of electrons.