potassium-39
An island in the Northern Sporades / A town in Greece located on the island of the same name.
(rare, poetic) A female snake.
Requiring a great expense for something to be given over or conceded. / Gained at the cost of incurring unwelcome consequences.
(physics) The major stable isotope of potassium, ³⁹₁₉K, having nineteen protons and twenty neutrons; it amounts to over 93% of the element in nature
質量分析計は実験中、他の同位体から主要な安定同位体であるカリウム39をはっきりと識別した。
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