Daily Archives: January 17, 2017


Milk curdles when its pH drops, allowing protein molecules in milk to clump together. (Tess Watson)
Curdled milk is what you get when lumps form in smooth milk. Although the clumps form in spoiled milk, the chemical reaction that causes curdling also occurs in fresh milk, under the right conditions. Intentional curdling of milk is used to produce foods, such as yogurt, cheese, and buttermilk. Here’s […]

Why Milk Curdles



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

Actinium Facts – Atomic Number 89 or Ac



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

Americium Facts – Element 95 or Am


Element 107 - Bohrium
Element Name: Bohrium (formerly Nielsbohrium) Atomic Number: 107 Symbol: Bh Atomic Weight: [264] Discovery: Dubna (Russia) 1975 or Heavy Ion Research Lab (Germany) 1976 Electron Configuration: [Rn] 7s2 5f14 6d5 Word Origin: Formerly Ns, Nielsbohrium. Named in honor of Niels Bohr. Sources: Bohrium is a man-made element. In 1976, Soviet […]

Bohrium Facts – Element 107 or Bh


Dysprosium is a silver-colored rare earth element. This is a chunk of purified dysprosium metal. Tomihahndorf
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 Facts – Element 66 or Dy