What is the mass number of an atom whick has 11 protons, 11 electrons, and 12 neutrons?A. 11 b. 22 c. 12 d. 23. Created by elishwahh. Science

Answer:(1) the atomic number, Z , is always equal to the number of protons.Z = number of protons(2) for ground state elements (no charge) the number of protons is equal to the number of electronsZ = number of protons = number of electrons (no charge)otherwise, the number of electrons is greater than the number of protons if it's an anion (negative charge), and the number of electrons is less than the number of protons if it's a cation (positive charge).Z = number of protons < number of electrons ( negative,X− )Z = number of protons > number of electrons ( positive,X+ )(3) the atomic mass, A , is always equal to the sum of the number of protons and neutrons.A = number of protons + number of neutrons orA = Z + number of neutrons Therefore, to answer your question above, based on rule 3:A = Z + number of neutrons A = 11 protons + 12 neutronsA = 23 uExplanation:D.23 sana makatulong