Question

Question 6
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 number = number of protons = number of neutrons
(iv) Atomic number = number of protons = number of electrons

(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)

Answer 1

The answer is (d).
Mass number = number of protons + number of neutrons
Atomic number = number of protons = number of electrons
Therefore,
Points (ii) and (iv) are correct.