Question

atomic standard meaning please​

Answer 1

Answer:

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The caesium standard is a primary frequency standard in which the photon absorption by transitions between the two hyperfine ground states of caesium-133 atoms are used to control the output frequency.

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Answer 2

Answer:

The standard atomic weight (Ar, standard) of a chemical element is the weighted arithmetic mean of the relative isotopic masses of all isotopes of that element weighted by each isotope's abundance on Earth. ... Of the 118 known chemical elements, 80 have stable isotopes and 84 have this Earth-environment based value.