The discoveries of mendelevium, nobelium, and lawrencium followed. While at Berkeley he co-discovered mendelevium. In total, seventeen mendelevium atoms were produced. The fourth one eventually officially proved the chemical identification of the 101st element, mendelevium. Divalent mendelevium metal should have a metallic radius of around . Mendelevium (Md) is a synthetic element, and thus a standard atomic weight cannot be given. Since 1952, elements 101 (mendelevium) to 117 (tennessine) have been synthesized. Mendelevium was the ninth transuranic element to be synthesized. Mendelevium can form coordination complexes with 1,2-cyclohexanedinitrilotetraacetic acid (DCTA). Mendelevium is a synthetic element with the symbol Md (formerly Mv) and atomic number 101.