Relative number for the mass of an atomSmallest particle of an element which cannot be chemically d.... The atomic weight scale is based on the carbon atomSmallest particle of an element which cannot be chemically d... with a nucleusPositively charged nucleus of an atom. Its diameter amounts ... made up of six protons and six neutrons. It was allocated the atomic weight 12. Thus, the atomic weight unit is 1/12 of the weight of carbon-12. The atomic mass unit u is equal to 1.66053873·10-27 kg.
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