potassium 39

po·tas·si·um 39 (39K),

(pō-tas'ē-ŭm),
Most abundant, nonradioactive isotope of potassium; accounts for 93.1% of natural potassium.

po·tas·si·um 39

(pŏ-tas'ē-ŭm)
Most abundant, nonradioactive isotope of potassium; accounts for 93.1% of natural potassium.
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Chlorine 35.5 Bromine 80 Tellerium 127 Potassium 39 Rubidium 85.4 Cesium 133 Calcium 40 Strontium 87.6 Barium 137 To complete the table, Mendeleev wrote the names of the elements, their atomic weights, and their chemical properties on cards and played "chemical solitaire" with them until he had the correct arrangement.