Identify the correct statement about the atomic number and mass number of an atom.

• A. Atomic number is equivalent to the number of neutrons while the mass number is equivalent to the sum of the number of protons and number of electrons.
• B. Atomic number is equivalent to the number of protons while the mass number is equivalent to the sum of the number of protons and number of neutrons.
• C. Atomic number is equivalent to the sum of the number of protons and number of neutrons while the mass number is equivalent to the number of protons.
• D. Atomic number is equivalent to the sum of the number of protons and number of electrons while the mass number is equivalent to the number of neutrons.

Answer: (B)