Relative Atomic Mass and Atomic Mass Unit (amu) | Fundamental of chemistry | class 9th Chemistry |

Relative Atomic Mass and Atomic Mass Unit As we know that the mass of an atom is too small to be determined practically. However, certain instruments enable us to determine the ratio of the atomic masses of various elements to that of carbon-12 atoms. This ratio is known as the relative atomic mass of the element. The relative atomic mass of an element is the average mass of the th atoms of that element as compared to 1/12 (one-twelfth) the mass of an atom of carbon12 isotope (an element having different mass number but same atomic number). Based th on carbon-12 standard, the mass of an atom of carbon is 12 units and l/2 of it comes to be 1 unit. When we compare atomic masses of other elements with atomic mass of carbon12 atom, they are expressed as relative atomic masses of those elements. The unit for relative atomic masses is called atomic mass unit, with symbol 'amu'. One atomic mass th th unit is 1/12 the mass of one atom of carbon-12 . When this atomic mass unit is expressed in grams.
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