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Large and detailed infographic of the element of Protactinium 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 Aerial of historic downtown Lancaster, Pennsylvania with blooming trees Protactinium Icon 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. Harrisburg, Pennsylvania, USA Letter pa business modern logo template, p a letter monogram vector logo Flooded Bridge Reflected in Snowy Winter Scene 音響設備 3d periodic table protactinium science chemical element