No, although their masses are very close. The difference is noticed when one considers the internal structure of the particles: a proton is comprised of two up quarks and one down quark, whereas the neutron is comprised of two down quarks and one up quark.
Mass number is about the neutrons and protons. The total of neutrons and protons.
The mass number is the average atomic mass of all the isotopes that are found in nature.
Mass number!:)
The sum of all protons and neutrons - Apex Learning
The number of protons
Mass of an atom = mass of protons + mass of neutrons
Mass number = Protons+Neutrons
Physics has not managed to discover a particle that accounts for mass
The major contribution to the mass of an atom is from protons and neutrons; electrons have a known but negligible mass.
No; the mass of proton is similar to the mass of neutrons.
For a stable atom, no. of protons= no. of electrons no of neutrons= Atomic Mass- no. of protons
The mass number of an element is equal to the sum of the elements neutrons and protons.