Elements are the smallest units of matter that can’t be divided using chemical means. They are the building blocks of matter. Learn the names of the elements and get facts about them.

These are vials of glowing actinium-225. Oak Ridge National Laboratory, US Department of Energy

Actinium Facts – Atomic Number 89 or Ac

Element Name: Actinium Symbol: Ac Atomic Number: 89 Atomic Weight: 227.0278 Electron Configuration: [Rn] 6d1 7s2 Element Classification: Radioactive Rare Earth (Actinide Series) Discovery: Andre-Louis Debierne 1899 (France) Word Origin: Greek: akis, aktinos (ray). Melting Point (K): 1320 Boiling Point (K): 3470 Appearance: heavy, silvery-white metal that is highly radioactive […]

Americium Facts – Element 95 or Am

Element Name: Americium Atomic Number: 95 Symbol: Am Atomic Weight: 243.0614 Electron Configuration: [Rn] 5f7 7s2 Atomic Number: 95 Element Classification: Radioactive Rare Earth Element (Actinide Series) Discovered By: G.T.Seaborg, R.A.James, L.O.Morgan, A.Ghiorso Discovery Date: 1945 (United States) Name Origin: named for the American continent, similar to the naming of […]

This is a disk of americium-241 viewed under a microscope. Bionerd, Creative Commons License

Dysprosium Facts – Element 66 or Dy

Element Name: Dysprosium Atomic Number: 66 Symbol: Dy Atomic Weight: 162.50 Discovered By: Paul-Emile Lecoq de Boisbaudran Discovery Date: 1886 (France) Electronic Configuration: [Xe] 4f10 6s2 Atomic Weight: 162.50 Element Classification: Rare Earth (Lanthanide Series) Name Origin: Greek: dysprositos (hard to get at) Density (g/cc): 8.55 Melting Point (°K): 1685 […]

Dysprosium is a silver-colored rare earth element. This is a chunk of purified dysprosium metal. Tomihahndorf