Question

1. It is the mass of an atom, approximately equivalent to the number of protons
and neutrons in the atom.​

Answer 1

Answer:

Protons and neutrons have approximately the same mass, about 1.67 × 10-24 grams, which scientists define as one atomic mass unit (amu) or one Dalton. Each electron has a negative charge (-1) equal to the positive charge of a proton (+1). Neutrons are uncharged particles found within the nucleus.