Locate and Identify Black Locust in North America

Locate and Identify Black Locust in North America Robinia pseudoacacia, commonly known as the black locust, is a prickly tree within the subfamily Faboideae of the pea family called  Fabaceae and is considered to be a legume with flattened pea pods several inches long. Black locust is native to the southeastern United States, but has been widely planted and naturalized elsewhere in temperate North America, Europe and Asia. The original range of the locust is in the Appalachian, Ozark and Ouachita range  located in the middle mountains of Eastern North America.  They are now considered an invasive species in some areas even within the natural range. Black locust was introduced into Britain in 1636 where it has slowly garnered a universal appeal to tree lovers. Black Locust Identification One major identifier is the long compound leaves with up to 19 leaflets which present  the typical and unique locust leaf profile (not to be confused with the twice compound leaves of honey locust). The other ID marker is a small stout briar spine  on branches, often curved and in pairs at each leaf node. Late spring to early summer flowers can be showy, white and drooping  with 5-inch flower clusters. These flowers are fragrant with a vanilla and honey scent. The leguminous fruit developing from the flower has 4-inch papery thin pods with small, dark-brown, kidney-shaped seeds. These autumn seeds will persist until the next spring. You will find this tree primarily  in areas where it colonizes open fields and roadsides. Its ability to grow in poor soils, fast growth, ornamental foliage and fragrant flowers make for a favorite tree to plant. More on Black Locust Black locust is sometimes called yellow locust and grows naturally on a wide range of sites but does best on rich moist limestone soils.  Black locust is not a commercial timber species but is useful for many other purposes. Because it is a nitrogen fixer and has rapid juvenile growth, it is widely planted as an ornamental, for shelterbelts, and for land reclamation. It is suitable for fuelwood and pulp and provides cover for wildlife, browse for deer, and cavities for birds. We must recognize that black locust is not an important tree for logging purposes as there is very little timber value and it has little lumber or paper pulp potential. We still need to remember that the tree has and is used  in the United States to be manufactured into a wide variety of products. Robinia pseudoacacia is planted for many specialized purposes. Black locust is used for fence posts, mine timbers, poles, railroad ties, insulator pins, ship timber, tree nails for wooden ship construction, boxes, crates, pegs, stakes, and novelties. Pulp with satisfactory mechanical properties can be made from the tree, particularly by the sulfate process but commercial value awaits  further investigation.

Xenon Facts - Periodic Table of the Elements

Xenon Facts - Periodic Table of the Elements Xenon is a noble gas. The element has atomic number 54 and element symbol Xe. Like all the noble gases, xenon is not very reactive, yet it has been known to form chemical compounds. Here is a collection of xenon facts, including the elements atomic data and properties. Xenon  Basic Facts Atomic Number: 54 Symbol: Xe Atomic Weight: 131.29 Discovery: Sir William Ramsay; M. W. Travers, 1898 (England) Electron Configuration: [Kr] 5s2 4d10 5p6 Word Origin: Greek xenon, stranger; xenos, strange Isotopes: Natural xenon consists of a mixture of nine stable isotopes. An additional 20 unstable isotopes have been identified. Properties: Xenon is a noble or inert gas. However, xenon and other zero valance elements do form compounds. Although xenon is not toxic, its compounds are highly toxic due to their strong oxidizing characteristics. Some xenon compounds are colored. Metallic xenon has been produced. Excited xenon in a vacuum tube glows blue. Xenon is one of the heaviest gases; one liter of xenon weighs 5.842 grams. Uses: Xenon gas is used in electron tubes, bactericidal lamps, strobe lamps, and lamps used to excite ruby lasers. Xenon is used in applications where a high molecular weight gas is needed. The perxenates are used in analytical chemistry as oxidizing agents. Xenon-133 is useful as a radioisotope. Sources: Xenon is found in the atmosphere at levels of approximately one part in twenty million. It is commercially obtained by extraction from liquid air. Xenon-133 and xenon-135 are produced by neutron irradiation in air cooled nuclear reactors. Xenon Physical Data Element Classification: Inert Gas Density (g/cc): 3.52 ( -109 °C) Melting Point (K): 161.3 Boiling Point (K): 166.1 Appearance: heavy, colorless, odorless noble gas Atomic Volume (cc/mol): 42.9 Covalent Radius (pm): 131 Specific Heat (20 °C J/g mol): 0.158 Evaporation Heat (kJ/mol): 12.65 Pauling Negativity Number: 0.0 First Ionizing Energy (kJ/mol): 1170.0 Oxidation States: 7 Lattice Structure: Face-Centered Cubic Lattice Constant (Ã…): 6.200 References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Langes Handbook of Chemistry (1952), CRC Handbook of Chemistry Physics (18th Ed.) Return to the Periodic Table