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what is helium and the atomic mass and atomic numberwhat is the what is the atomic mass number of Barium ​

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The atomic weight of helium is 4.002602, the average that reflects the typical ratio of natural abundances of its isotopes. Atomic weight is measured in atomic mass units (amu), also called daltons.

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Atomic weight.

element barium

symbol Ba

atomic number 56

atomic weight 137.327