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B3.  ISOTOPES & RELATIVE ISOTOPIC MASSES - 4

 3.4  CALCULATING A   FOR POLYNUCLIDIC ELEMENTS   

(i.e., those displaying isotopy) 

r 

The Relative Atomic Mass (Ar) of a polynuclidic element is obtained by calculating the
'weighted-average’ mass arising from the contributions of the various isotopes,
i.e., from a consideration of its isotopic composition, aka relative abundances.

2019_Relative_atomic_mass_isotopes_v3nOR

In order better to appreciate the quite simple arithmetical procedure involved in such calculations, the first example considered concerns nothing more complicated than several planks of wood
of two different lengths.  In a science lab this can easily be demonstrated using wooden splints.

2019_Relative_atomic_mass_isotopes_v3nOR
2019_Relative_atomic_mass_isotopes_v3nOR
2019_Relative_atomic_mass_isotopes_v3nOR

text books, www sites and, unsurprisingly therefore, pupils/students/learners/instructors.

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