Question

(a) Name the element used as a standard for atomic mass scale. 

(b) Which particular atom of the above element is used for this purpose? 

(c) What value has been given to the mass of this reference atom?

Answer 1

(a) Carbon is used as a standard for atomic mass scale. 

(b) Atom with 6 neutrons and 6 protons in its nucleus so that its mass number is 12. 

(c) Mass of this atom is 12 u.