• # question_answer The atomic number of an element is 11 and its mass number is 23. The correct order representing the number of electrons, protons and neutrons respectively in this atom is A)  11, 11, 12                      B)  11, 12, 11C)  12, 11, 11           D)        23, 11, 23.

no. of proton = At no.= number of ${{e}^{-}}$ =11 no. of p+ no. of n = Atomic mass $\therefore$ no. of $n=13-11=12$