Name (a) an element, (b) an isotope of the element, used as atomic mass unit.
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a) hydrogen.
b) isotope of hydrogen is protium it's mass is 1u which is considered as the mass of hydrogen
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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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atomic weight.
element helium
symbol He
atomic number 2
atomic weight 4.002602
Explanation:
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