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Protactinium electron configuration and its properties-vector illustration Protactinium as Element 91 of the Periodic Table. Concept illustration on abstract blue purple gradient rings seamless loop background. Title design for science content and infographic showcase displa Large and detailed infographic of the element of Protactinium 3d periodic table protactinium science chemical element Aerial of historic downtown Lancaster, Pennsylvania with blooming trees Protactinium Icon Pedestrian Bridge in Snow in Harrisburg, PA Protactinium symbol - Pa. Element of the periodic table zoomed with magnifying glass Protactinium on periodic table of the elements. Radioactive metallic element in the actinide series, with atomic number 91 and symbol Pa. Formerly protoactinium, meaning nuclear precursor of actinium. 音響設備 Initial PA Logo Design Vector Harrisburg, Pennsylvania, USA