Praseodymium

Praseodymium is atom number 59 — every Praseodymium atom has exactly 59 protons in its center, and that number is what makes it Praseodymium and nothing else. Its symbol is Pr. At room temperature it is a solid.

Praseodymium is a chemical element with symbol Pr and atomic number 59. Praseodymium is a soft, silvery, malleable and ductile metal in the lanthanide group. It is valued for its magnetic, electrical, chemical, and optical properties.

Summary from the source dataset, derived from Wikipedia (CC BY-SA 3.0) · original article

Praseodymium sits in period 6, group 3 of the f-block. Its 59 electrons fill shells of 2, 8, 18, 21, 8, 2 — written as [Xe] 4f3 6s2. Its electronegativity is 1.13 on the Pauling scale, and pulling the first electron off takes 527 kJ/mol. The outermost shell holds 2 electrons — the ones that do all the chemistry.

Full configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f3
Ionization energies (kJ/mol): 527, 1020, 2086, 3761, 5551
Electron affinity: 93 kJ/mol · Electronegativity (Pauling): 1.13
Density: 6.77 g/cm³ · melts 1208 K · boils 3403 K

Values exactly as published — see where the data comes from.