鉕,化學元素也,符號為Pm,原子序六十一。屬鑭系元素、稀土金屬,氧化態獨以正三為穩。各同位素俱富放射能,易於衰變。元素在其先後者,皆具穩定同位素,獨其無有,實屬罕見,惟鎝亦然。
一九四五年,美國橡樹嶺國立實驗室始以鈾核裂變製得之。自然之中,幾稀,蓋衰變自銪一五一、諸鈾同位素。諸同位素中,雖以鉕一四五為最穩,獨鉕一四七有所用,夜光漆、原子能電池、測厚儀,悉其用也。
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