In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A) : One atomic mass unit is defined as one twelfth of the mass of one carbon-12 atom.
Reason (R) : Carbon-12 isotope is the most abundant isotope of carbon and has been chosen as standard.
One atomic mass unit is defined as one twelfth of the mass of one C-12 atom but it is taken as standard not because of the abundance of C-12. It is taken because this isotope of carbon, C-12 has a whole number as a measure of atomic mass hence it is simpler to carry out measurements of other elements.