What is a "rep" in strength training? the number of times to complete the full motion of an exercise the number of exercises completed the number of motions made in a workout the number of weights lifted during a training session

I think it is the first one, I may be wrong

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass