Mercury

http://www.chemicalelements.com/bohr/b0080.gif (Photo of Bohr model)

__**Area Five:**__Seven naturally occurring isotopes of mercury are known. They are mercury-196, mercury-198, mercury-199, mercury-200, mercury-201, mercury-202, and mercury-204. Although many labs/companies use Mercury you can't purchase it as an individual. this is due to the fact that Mercury is a carcinogen and is deadly to humans if consumed. **http: //www.teachertube.com/view_video.php?viewkey=391905f9ee07bcc7c596** **Atomic Number:** 80 **Atomic Mass:** 200.59 __**Area Four:**__ Mercury also enters into the environment through the disposal (e.g., landfilling, incineration) of certain products. Products containing mercury include: auto parts, [|batteries], fluorescent bulbs, medical products, thermometers, and thermostats.[|[][|14][|]] Due to health concerns (see below), [|toxics use reduction] efforts are cutting back or eliminating mercury in such products. For example, most [|thermometers] now use pigmented [|alcohol] instead of mercury. Mercury thermometers are still occasionally used in the medical field because they are more accurate than alcohol thermometers, though both are being replaced by electronic thermometers. Mercury thermometers are still widely used for certain scientific applications because of their greater accuracy and working range. The [|United States] [|Clean Air Act], passed in 1990, put mercury on a list of toxic pollutants that need to be controlled to the greatest possible extent. Thus, industries that release high concentrations of mercury into the environment agreed to install maximum achievable control technologies (MACT). In March 2005 EPA rule[|[][|15][|]] added power plants to the list of sources that should be controlled and a national [|cap and trade] rule was issued. States were given until November 2006 to impose stricter controls, and several States are doing so. The rule was being subjected to legal challenges from several States in 2005 and decision was made in 2008. The Clean Air Mercury Rule was struck down by a Federal Appeals Court on February 8, 2008. The rule was deemed not sufficient to protect the health of persons living near coal fired power plants. The court opinion cited the negative impact on human health from coal fired power plants' mercury emissions documented in the EPA Study Report to Congress of 1998.[|[][|16][|]]
 * __Area Two:__**Mercury is a metallic chemical element identified by the symbol Hg on the **[|periodic table]**. It is silver in **[|color]** and unlike other metals mercury is liquid at room **[|temperature]**. The ancient name for mercury was quicksilver, meaning "living" silver. This name reflected mercury's lustrous silver color and its unusually lively behavior. When it is poured onto a smooth surface, it forms beads that roll rapidly around. The element's modern name comes from Mercury (or Mercurius), the fleet-footed messenger of the gods in Roman mythology.** Who discovered this element? The ancient Chinese, Egyptians, Hindus, and Romans knew about this element. It was found in the Egyptian tombs. It is named after the the Roman God who was a swift messenger. This element was found in thermometers until the recent push to get rid of the element due to the fact that it has been proven deadly if consumed. **
 * __Area One & Three:__** __Mercury-The 80th **Element**__
 * Melting Point:** -38.87 °C (234.28 K, -37.966 °F) **Atomic Number:** 80**Boiling Point:** 356.58 °C (629.73 K, 673.844 °F)
 * Number of Protons/Electrons:** 80 **Period:** 6 **Melting Point:** -37.966 degrees fairenheit
 * Number of Neutrons:** 121 [|WebElements.com – Mercury] **Isotopes:** Mercury-196, Mercury-198, and Mercury-200-202
 * Classification:** [|Transition Metal] **Crystal Structure:** Rhombohedral **Percent Abundance:**
 * Density @ 293 K:** 13.456 g/cm3 **Group:** 12 **Color:** Silvery Metal Color **Texture:** Thick, heavy liquid
 * Room temperature:** Liquid **Atomic Number:** 80 **Period:6** **Chemical Symbol:**Hg