which element is presently choose as standard for classification of atomic mass.
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3
Answer:
carbon-12
Since 1961 the standard unit of atomic mass has been one-twelfth the mass of an atom of the isotope carbon-12. An isotope is one of two or more species of atoms of the same chemical element that have different atomic mass numbers (protons + neutrons).
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1
Answer:
hydrogen
frm hydrogen the calculation of atomic mass
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