Neodymium

Neodymium is atom number 60 — every Neodymium atom has exactly 60 protons in its center, and that number is what makes it Neodymium and nothing else. Its symbol is Nd. At room temperature it is a solid.

Neodymium is a chemical element with symbol Nd and atomic number 60. It is a soft silvery metal that tarnishes in air. Neodymium was discovered in 1885 by the Austrian chemist Carl Auer von Welsbach.

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

Neodymium sits in period 6, group 3 of the f-block. Its 60 electrons fill shells of 2, 8, 18, 22, 8, 2 — written as [Xe] 4f4 6s2. Its electronegativity is 1.14 on the Pauling scale, and pulling the first electron off takes 533.1 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 4f4
Ionization energies (kJ/mol): 533.1, 1040, 2130, 3900
Electron affinity: 184.87 kJ/mol · Electronegativity (Pauling): 1.14
Density: 7.01 g/cm³ · melts 1297 K · boils 3347 K

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