Protactinium

Protactinium is a chemical element with symbol Pa and atomic number 91. It is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. It forms various chemical compounds where protactinium is usually present in the oxidation state +5, but can also assume +4 and even +2 or +3 states.

Properties

• Phase: Solid
• Density: 15.37 g/cm³
• Melting Point: 1841 K
• Boiling Point: 4300 K

Uses