Question

quiz 1
google classroom of microsoft teams of
what is the mass number of an isotope equal to?
choose 1 answer:
the sum of the number of protons and electrons
the sum of the number of protons and neutrons
the difference between the number of protons and electrons
the difference between the number of protons and neutrons

Explanation:

The mass number of an isotope is a fundamental concept in chemistry. It is defined as the sum of the number of protons and neutrons in the nucleus of an atom. Protons and neutrons are the particles that contribute significantly to the mass of an atom. Electrons have a negligible mass compared to protons and neutrons, so they are not included in the calculation of the mass number.

Answer:

B. the sum of the number of protons and neutrons