Question

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 

(a) (i) and (ii) 

(b) (i) and (iii) 

(c) (ii) and (iii) 

(d) (ii) and (iv)

Answer 1

(d) (ii) and (iv)