Americium

Americium is atom number 95 — every Americium atom has exactly 95 protons in its center, and that number is what makes it Americium and nothing else. Its symbol is Am. At room temperature it is a solid.

Americium is a radioactive transuranic chemical element with symbol Am and atomic number 95. This member of the actinide series is located in the periodic table under the lanthanide element europium, and thus by analogy was named after the Americas. Americium was first produced in 1944 by the group of Glenn T.Seaborg from Berkeley, California, at the metallurgical laboratory of University of Chicago.

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

Americium sits in period 7, group 3 of the f-block. Its 95 electrons fill shells of 2, 8, 18, 32, 25, 8, 2 — written as [Rn] 5f7 7s2. Its electronegativity is 1.13 on the Pauling scale, and pulling the first electron off takes 578 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 4f14 5d10 6p6 7s2 5f7
Ionization energies (kJ/mol): 578
Electron affinity: 9.93 kJ/mol · Electronegativity (Pauling): 1.13
Density: 12 g/cm³ · melts 1449 K · boils 2880 K

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