Promethium

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Promethium sī 1 ê hoà-ha̍k goân-sò͘. I ê goân-chú-hoan sī 61, hoà-ha̍k hû-hō sī Pm.

Quick Facts Ki-pún sèng-chit, Miâ, hû-hō ...
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Chham-khó

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