Question

Which element is used as standard when comparing masses of atoms?

1) Hydrogen
2) Carbon
3) Oxygen
4) Nitrogen

Answer 1

The element used as a standard when comparing masses of atoms is carbon.

Step-by-step explanation:

The element used as standard when comparing masses of atoms is carbon. By definition, one atom of carbon-12 is assigned a mass of 12 atomic mass units (amu), making it the reference standard for atomic masses. The atomic mass of any isotope of any element is expressed in relation to the carbon-12 standard.