atomic number 105


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Related to atomic number 105: unnilpentium, element 105
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Noun1.atomic number 105 - a transuranic element
chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
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Decay of the heavier isotope eventually produces dubnium (atomic number 105), whereas the lighter isotope decays down to roentgenium (111).