Which of the following are true for an element?

(i) Atomic number = Number of protons + number of electrons


(ii) Mass number = Number of protons + number of neutrons


(iii) Atomic mass = Number of protons = Number of neutrons


(iv) Atomic number = Number of protons = Number of electrons


Options || A. (i) and (ii)


B. (i) and (iii)


C. (ii) and (iii)


D. (ii) and (iv)

Mass number is the numeric sum of the protons and the neutrons and the atomic number is equal to the number of protons, because the atom is neutral the number of electrons are also equal to the protons.

5