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?

A. carbon is the element which is used as the standard for atomic mass scale. 

B. 12C isotopes of carbon element is used as the standard for the atomic mass scale. 

C. The mass of 12C is exactly 12g. 

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