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uranium X₂
gen. 铀X₂ (UX₂, 镤的同位素,Pa²³⁴)
earth.sc. 铀 X₂镁的同位素 Pa231
uranium X2
gen. 轴 X2 (Pa234)
uranium X2
met. 铀 X2 (UX2, Pa234 镤同位素)