New Element Mendelevium, Atomic Number 101 Ghiorso, A. ; Harvey, B. G. ; Choppin, G. R. ; Thompson, S. G. ; Seaborg, G. T. Abstract Publication: Physical Review Pub Date: June 1955 DOI: 10.1103/PhysRev.98.1518 Bibcode: 1955PhRv...98.1518G