![]() The relative atomic mass of 1 hydrogen (H) atom compared to the carbon (C) atom becomes.In this scale, the relative mass of a carbon atom is accepted as 12. (b) Carbon (C) atom: The carbon atom is selected as reference atom. Therefore, carbon was selected as a reference atom. On this scale, the relative atomic mass of many elements comes out to be fractional. The relative mass of a hydrogen atom is 1 which has only 1 proton in its nucleus. (a) Hydrogen (H) atom: The hydrogen atom is the lightest. To express relative mass of an atom, reference of atom is considered.Therefore, the concept of relative mass of an atom was formed. ![]()
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