ፕሮሜቲየም
ፕሮሚቲየም (Promethium)የንጥረ ነገሮች ሠንጠረዥ ውስጥ ኬሚካዊ ውክሉ Pm ነው። አቶማዊ ቁጥሩም 61 ነው።
(ይህ ሳይንስ ነክ ጽሑፍ መሠረት ወይም መዋቅር ነው። እርስዎ ሊያስፋፉት ይችላሉ!)
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