Mauk,+Thomas

**Boiling point – 2143 k** **Melting point – 1000 k** **Specific gravity/ density – 3510 kg m -3** **Number of:** **Protons-56** **Neutrons-56** **Electrons-81** **Atomic mass- 137.32** **Atomic number- 56** **Electron configuration and orbital notation- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2** **Number of valence electrons- 2** **How, when and who:** **Who- Humphrey Davy** **When- 1808** **How- Humphrey Davy used the electrolysis of molten baryta.** **Processed, produced, mined:** **Barium enters the air when mining is taking place** **Chemical and physical properties:** **Liquid range- 1143 k** **Critical temperature- no data** **Super conduction temp. - no data** **Reacts with water** **Reacts with halogens** **Found at…….** **Barium is never found In nature usually in the ores of barite or a lesser amt. of witherite** **Chemical reactions of barium** **Reacts with acids and bases, water and halogens** **Industrial or commercial uses-barium sulfite for its density, makes glass.** **Cost- 55$ per 100g**
 * Barium, Ba**
 * Electron configuration- first energy level 2, second energy level 8, third energy level 18**

**Bohr model:** **Picture of element:** **Unusual facts: barium is used as a “getter” in vacuum tubes, its compounds are used in pigments, barium is only found combined with other elements. Also its an alkaline earth metal.** work sited: www. webelements.com, mark winter, 2012. [|www.chemcool.com.]5 feb,2012, powered by unknown. www.chemistryexplained.com, 2012, powered by jrank. [|www.chemtutor.com], powered by freefind, 2012.