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Message definition (Potassium ) Neutral potassium atoms have 19 electrons, one more than the configuration of the [[noble gas]] [[argon]]. Because of its low first [[ionization energy]] of 418.8{{nbsp}}kJ/mol, the potassium atom is much more likely to lose the last electron and acquire a positive charge, although negatively charged [[alkalide]] {{chem2|K−}} ions are not impossible. In contrast, the second ionization energy is very high (3052{{nbsp}}kJ/mol).
中性のカリウム原子は19個の電子を持ち、希ガス アルゴン の配置よりも1個多い。最初のイオン化エネルギー が418.8 kJ/molと低いため、カリウム原子は最後の電子を失って正電荷を帯びる可能性が高いが、負電荷を帯びたアルカリド K− イオンも不可能ではない。対照的に、第二イオン化エネルギーは非常に高い（3052 kJ/mol）。