Silver Facts (Atomic Number 47 and Element Symbol Ag)

Silver is a transition metal with element symbol Ag and atomic number 47. The element is found in jewelry and currency for its beauty and value and in electronics for its high conductivity and malleability. Silver  Basic Facts Atomic Number: 47 Symbol: Ag Atomic Weight: 107.8682 Discovery: Known since prehistoric time. Man learned to separate silver from lead as early as 3000 B.C. Electron Configuration: [Kr]5s14d10 Word Origin: Anglo-Saxon Seolfor or siolfur; meaning silver, and Latin argentum meaning silver Properties: The melting point of silver is 961.93 °C, boiling point is 2212 °C, specific gravity is 10.50 (20 °C), with a valence of 1 or 2. Pure silver has a brilliant white metallic luster. Silver is slightly harder than gold. It is very ductile and malleable, exceeded in these properties by gold and palladium. Pure silver has the highest electrical and thermal conductivity of all metals. Silver possesses the lowest contact resistance of all metals. Silver is stable in pure air and water, although it tarnishes upon exposure to ozone, hydrogen sulfide, or air containing sulfur. Uses: The alloys of silver have many commercial uses. Sterling silver (92.5% silver, with copper or other metals) is used for silverware and jewelry. Silver is used in photography, dental compounds, solder, brazing, electrical contacts, batteries, mirrors, and printed circuits. Freshly deposited silver is is the best known reflector of visible light, but it rapidly tarnishes and loses its reflectance. Silver fulminate (Ag2C2N2O2) is a powerful explosive. Silver iodide is used in cloud seeding to produce rain. Silver chloride can be made transparent and is also used as a cement for glass. Silver nitrate, or lunar caustic, is used extensively in photography. Although silver itself is not considered toxic, most of its salts are poisonous, due to the anions involved. Exposure to silver (metal and soluble compounds) should not exceed 0.01 mg/M3 (8 hour time-weighted average for a 40 hour week). Silver compounds can be absorbed into the circulatory system, with deposition of reduced silver in body tissues. This may result in argyria, which is characterized by a greyish pigmentation of the skin and mucous membranes. Silver is germicidal and may be used to kill many lower organisms without harm to higher organisms. Silver is used as coinage in many countries. Sources: Silver occurs native and in ores incuding argentite (Ag2S) and horn silver (AgCl). Lead, lead-zinc, copper, copper-nickel, and gold ores are other prinicipal sources of silver. Commercial fine silver is at least 99.9% pure. Commercial purities of 99.999% are available. Element Classification: Transition Metal Silver Physical Data Density (g/cc): 10.5 Appearance: silvery, ductile, malleable metal Isotopes: There are 38 known isotopes of silver ranging from Ag-93 to Ag-130. Silver has two stable isotopes: Ag-107 (51.84% abundance) and Ag-109 (48.16% abundance). Atomic Radius (pm): 144 Atomic Volume (cc/mol): 10.3 Covalent Radius (pm): 134 Ionic Radius: 89 (2e) 126 (1e) Specific Heat (20 °C J/g mol): 0.237 Fusion Heat (kJ/mol): 11.95 Evaporation Heat (kJ/mol): 254.1 Debye Temperature (K): 215.00 Pauling Negativity Number: 1.93 First Ionizing Energy (kJ/mol): 730.5 Thermal Conductivity: 429 W/m ·K 300 K Oxidation States: 1 (most common), 2 (less common), 3 (less common) Lattice Structure: Face-Centered Cubic Lattice Constant (Ã…): 4.090 CAS Registry Number: 7440-22-4 Silver Trivia: Silvers element symbol Ag, is from the Latin word argentum meaning silver.In many cultures, and some alchemical texts, silver was associated with the Moon while gold was associated with the Sun.Silver has the highest electrical conductivity of all metals.Silver has the highest thermal conductivity of all metals.Silver halide crystals darken when exposed to light. This process was vital to photography.Silver is considered one of the noble metals.Silver is slightly harder (less malleable) than gold.Silver ions and silver compounds are toxic to many types of bacteria, algae and fungi. Silver coins used to be stored in containers of water and wine to prevent spoiling.Silver nitrate has been used to prevent infection in burns and other wounds. More Silver Facts Sources Emsley, John (2011). Natures building blocks: An A-Z Guide to the Elements. Oxford University Press. pp. 492–98. ISBN 978-0-19-960563-7.Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.Hammond, C. R. (2004). The Elements, in Handbook of Chemistry and Physics (81st ed.). CRC press. ISBN 978-0-8493-0485-9.Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.

Hotel on the Corner of Bitter and Sweet - Questions

Published in 2009, this historical fiction novel has been a book club favorite since it was released. Use these book club discussion questions on by Jamie Ford to lead your book club into Fords novel. Spoiler Warning: These book club discussion questions reveal important details about Hotel on the Corner of Bitter and Sweet by Jamie Ford. Finish the book before reading on. Why do you think Hotel on the Corner of Bitter and Sweet was told in flashbacks? What perspective can an older Henry give?How was Henrys relationship with Marty different than his relationship with his father? How was it the same? Even though tradition was important to both men, how did Henry and his father view tradition and heritage differently?Was the information the novel presented about Japanese-American internment new to you? What did you learn?Do you think Henry was right to stay with Ethel even after he found out about his fathers deceit? Should he have searched for Keiko?Do you think Ethel knew what was happening to Henrys letters?If you were Henry, could you forgive your father?What do you think happened after the novel ended?Rank Hotel on the Corner of Bitter and Sweet by Jamie Ford on a scale of 1 to 5.

The Cost Of Obtaining A Higher Education - 1633 Words

40,000,000 can be an extremely daunting number. This number is the approximate amount of people in the United States that owe a collective total of $1.2 trillion in student loan debt (Dynarski par. 1). They are only gigantic numbers on paper, but in real life, their meaning is life changing. People are struggling in ways that those viewing the numbers can barely fathom, and the effects are alarming. The cost of obtaining a higher education is showing problems for the people, the economy, and the future of America. Jeff Rausch finds the statistic alarming- $1.2 trillion is owed by those of college age- young adults working for a better future (Dynarski par.1). With his background in business with a degree from Alfred University, he†¦show more content†¦The government has stated an inflation of 107% since 1992 in the sticker prices of college- and while the average cost of college after aid and scholarships has risen only 22%, it is still well above what is considered to be af fordable (Leonhardt par. 214). The increase in the ability to obtain federal loans with an increased loan limit seemed like a plan to assist students in gaining the funds they needed, which turned into a downward spiral. This increase in the loan limit caused a drive in inflation, and the cost of college went up. Students almost doubled their monthly payments in the four years following the increase in the loan limit, showing that what started as a life line quickly turned into a nightmare (Sullivan par. 9). As students were attempting to do what was best for their future, they were being met with a back-breaking load of debt and inflation. When taking a look into the whirlwind of higher education costs, the personal effects are often overlooked. The effects on both the students, as well as their families, can be detrimental. Rausch is not surprised by the fact that 45% of loaners have stalled life events, such as purchasing a home, getting married, and having kids, due to the num ber hanging over their head and their desperate attempts to pay it back (Mulhere par. 2). Rausch was lucky enough to have most of his schooling covered by scholarships and tuition remission, but he knows that he could not be where he

Description of a person that I admire Marie Curie free essay sample

One of the people I really admire is a Polish physicist and chemist woman, full of courage and determination to investigate radioactivity. My admiration is not only for her talent but also for the fact that during the 19th Century, not many people could think about a woman changing millions of lives with her full-time studies, especially if she came from a poor family. That is the reason why Marie Curies generosity deserves our grateful thanks. Since she was a child, Marie Curie knew that the greatest desire of her life was becoming a physic and chemist as her father was. He was the one in charge of her daughter’s education due to Marie’s mother’s death. Most of the things she learnt were taught by her father, but when Marie had the age to go to University she started to work as a governess to be able to pay her travel to Paris where women could study. We will write a custom essay sample on Description of a person that I admire: Marie Curie or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Marie earned the money to go to France where she studied at Soborne University and lived from hand to mouth. Sometimes she fainted during classes because she didn’t eat well, but her passion and love for learning was so big that nothing could stop her. Another thing that made her studies at France difficult was her rusty French, but Marie’s tolerance helped her to overcome all of those situations because she knew what she wanted. While she was studying at University she met Pier Curie, who she married and raised a family with. Together, they developed the studying of radioactivity and shared with Henri Becquerel their Nobel Prize in Physics. After that Marie won the Nobel Prize in Chemistry. It is amazing how much strength she had to overcome her social condition to study and research radioactivity up to give her own life due to all of the years of exposure that made her developed cancer and died. At present, after 79 years from Marie’s death, I consider her as a hero for her discoveries and especially for her example of bravery and loyalty to her goals which are still saving lives in every hospital.