Zinc Facts - Periodic Table of the Elements

Atomic Number: 30 Symbol: Zn Atomic Weight: 65.39 Discovery: known since prehistoric time Electron Configuration: [Ar] 4s2 3d10 Word Origin: German zinke: of obscure origin, probably German for tine. Zinc metal crystals are sharp and pointed. It could also be attributed to the German word zin meaning tin. Isotopes: There are 30 known isotopes of zinc ranging from Zn-54 to Zn-83 . Zinc has five stable isotopes: Zn-64 (48.63%), Zn-66 (27.90%), Zn-67 (4.10%), Zn-68 (18.75%) and Zn-70 (0.6%). Properties Zinc has a melting point of 419.58Â °C, a boiling point of 907Â °C, a specific gravity of 7.133 (25Â °C), with a valence of 2. Zinc is a lustrous blue-white metal. It is brittle at low temperatures but becomes malleable at 100-150Â °C. It is a fair electrical conductor. Zinc burns in air at high red heat, evolving white clouds of zinc oxide. Uses: Zinc is used to form numerous alloys, including brass, bronze, nickel silver, soft solder, Geman silver, spring brass, and aluminum solder. Zinc is used to make die castings for use in the electrical, automotive, and hardware industries. The alloy Prestal, consisting of 78% zinc and 22% aluminum, is nearly as strong as steel yet exhibits superplasticity. Zinc is used to galvanize other metals to prevent corrosion. Zinc oxide is used in paints, rubbers, cosmetics, plastics, inks, soap, batteries, pharmaceuticals, and many other products. Other zinc compounds are also widely used, such as zinc sulfide (luminous dials and fluorescent lights) and ZrZn2 (ferromagnetic materials). Zinc is an essential element for humans and other animal nutrition. Zinc-deficient animals require 50% more food to gain the same weight as animals with sufficient zinc. Zinc metal is not considered toxic, but if fresh zinc oxide is inhaled it can cause a disorder referred to as zinc chills or oxide shakes. Sources: The primary ores of zinc are sphalerite or blende (zinc sulfide), smithsonite (zinc carbonate), calamine (zinc silicate), and franklinite (zinc, iron, and manganese oxides). An old method of producing zinc was by reducing calamine with charcoal. More recently, it has been obtained by roasting the ores to form zinc oxide and then reducing the oxide with carbon or coal, followed by distillation of the metal. Zinc Physical Data Element Classification: Transition Metal Density (g/cc): 7.133 Melting Point (K): 692.73 Boiling Point (K): 1180 Appearance: Bluish-silver, ductile metal Atomic Radius (pm): 138 Atomic Volume (cc/mol): 9.2 Covalent Radius (pm): 125 Ionic Radius: 74 (2e) Specific Heat (20Â °C J/g mol): 0.388 Fusion Heat (kJ/mol): 7.28 Evaporation Heat (kJ/mol): 114.8 Debye Temperature (K): 234.00 Pauling Negativity Number: 1.65 First Ionizing Energy (kJ/mol): 905.8 Oxidation States: 1 and 2. 2 is the most common. Lattice Structure: Hexagonal Lattice Constant (Ã…): 2.660 CAS Registry Number:7440-66-6 Zinc Trivia: Zinc is the 24th most abundant element in the Earths crust.Zinc is the fourth most common metal used today (after iron, aluminum, and copper).Zinc exposed to air will form a layer of zinc carbonate by reacting with carbon dioxide. This layer protects the metal from further reactions with air or water.Zinc burns white-green in a flame test.Zinc is the last period four transition metal.Zinc oxide (ZnO) was once called philosophers wool by alchemists because it looked like wool when collected on a condenser after burning zinc metal.Half of the zinc produced today is used to galvanize steel to prevent corrosion.The U.S. penny is 97.6% zinc. The other 2.4% is copper. Sources Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Langes Handbook of Chemistry (1952), CRC Handbook of Chemistry Physics (18th Ed.) International Atomic Energy Agency ENSDF database (Oct 2010)

Women s Impact On Young Girls And Adult Women - 1438 Words

Having insecurities and flaws impacts almost anyone and also commonly on young girls and adult women. Many people think that having insecurities is just a phase that every young teen goes through that will eventually turn into confidence, but that isn’t always the case. Many women struggle daily with the way their appearances and even try to seek for approval as a way to boost their confidence. In today’s society, majority of young adults especially women are constantly on social media, looking through photos of women with the perfect body shapes and having the ideal life. But in reality, most of these women do have flaws of their own that is just unknown to the viewers. As a young adult, who has dealt with body image issues, it can†¦show more content†¦Janine DeMichele who was a web designer and actress, featured magazine called â€Å"Psychology Today† magazine, was never satisfied with the way she looked. As she start stumbling upon through online ph otographs such as on a social media platform such as Instagram, and search â€Å"fitspiration† or â€Å"fitspo† included pictures of women with a slender and toned body, thinking it would help her mental push in need to run an extra mile, as a way to motivate herself to make the effort to get herself fit. She describes, â€Å"‘I would look at the accounts of women posting their perfect pictures and then stand in front of the mirror comparing myself†Ã¢â‚¬â„¢(34), which also lead her to think that she would make a lot of progress with getting the â€Å"perfect† body that she wanted. Because social media has become a huge part of a young adults lives, many professional models will promote themselves through their fitness, giving other people motivation into working out more. Another genre of pictures called â€Å"thinspiration† which includes photos of women, showing off their extreme skinny bodies and could also lead to women to self-esteem and even causes them to eating disorders as an influence to think they are overweight or not skinny enough. At a young age from middle school to high school, I’ve also personally dealt with body image and feeling dissatisfied with the way I looked. At the age of 12, I

I dont know what I did wrong Essay Example For Students

I dont know what I did wrong Essay I dont know what I did wrong. I asked Amir agha, but he said I hadnt done anything. I would have stopped doing it, then maybe father and I wouldnt have had to leave. Before the kite tournament, Amir was my best friend, and we would always play together, but then he didnt want me around any more. There was nothing I could do to rekindle our relationship, Amir agha wouldnt let me. The last time I was properly with him, I really thought things might return to normal. We spoke like we used to; he told me about school and the teachers, but then he turned nasty. He started throwing pomegranates at me, screaming at me to fight back. But how could I ever do that to him? I remember at his party, his thirteenth, he ignored me all night. And I had to serve drinks to Assef. I knew I had to act as though nothing had happened. After all, it was Amirs night and I couldnt ruin it for him. Assef hit me, in the chest. It was nothing compared to what happened last time I saw him, and it was dark, so once again no one saw. I am thankful for that. After all we have done together; playing games and running in the streets, growing up together, I do not know what I have done for Amir agha to feel so angry at me. If feels as though I have lost my brother, as well as my best friend. There is nothing I would not do for him. I would eat dirt, if he asked me. We had planned to be friends forever, Amir agha and me. Hed even promised me he would buy me a television one day, and I would have kept it on the side where I keep all of my drawings. But that is no longer my home. My father plans for us to go and live with his cousin in Hazarajat. I am unsure as to what will happen to us then. Hopefully we will find a new master who is as kind as Baba sahib, although I am doubtful of that. I feel responsible for everyones pain, now. It is my fault that Amir agha is upset. I did not want him getting in to trouble, for putting the money under my mattress, and although I cannot understand why he did that, I know if I did not take responsibility for it, he would surely be blamed. As he is my best friend, brother, and master, I had to say it was me. But now, my father is deeply hurt at the loss of Baba sahib, as they grew up together and he was such a good master to us. Baba agha begged father to stay, he even cried for him, and that is also my fault. If I had been better to Amir agha, he would still like me, and none of this would have happened. I do not know what it was that made him hate me. It was after the kite tournament, and he won that, and I ran the kite for him. I know how much it meant to him, and I knew he wanted Baba to be proud of him, so I did everything I could to get him that kite. So why does he hate me? I dont think he saw what Assef did. If he did, surely he would have stopped them. I would have, had the situation been different. But since then, since I handed over the kite to him, he couldnt look me in the eyes. And now this. I feel betrayed by him, but if I knew what his reason was for it, then I am sure it would have been justifiable. .ud975a8efb11c8dac451debd7b956fca8 , .ud975a8efb11c8dac451debd7b956fca8 .postImageUrl , .ud975a8efb11c8dac451debd7b956fca8 .centered-text-area { min-height: 80px; position: relative; } .ud975a8efb11c8dac451debd7b956fca8 , .ud975a8efb11c8dac451debd7b956fca8:hover , .ud975a8efb11c8dac451debd7b956fca8:visited , .ud975a8efb11c8dac451debd7b956fca8:active { border:0!important; } .ud975a8efb11c8dac451debd7b956fca8 .clearfix:after { content: ""; display: table; clear: both; } .ud975a8efb11c8dac451debd7b956fca8 { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .ud975a8efb11c8dac451debd7b956fca8:active , .ud975a8efb11c8dac451debd7b956fca8:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .ud975a8efb11c8dac451debd7b956fca8 .centered-text-area { width: 100%; position: relative ; } .ud975a8efb11c8dac451debd7b956fca8 .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .ud975a8efb11c8dac451debd7b956fca8 .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .ud975a8efb11c8dac451debd7b956fca8 .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .ud975a8efb11c8dac451debd7b956fca8:hover .ctaButton { background-color: #34495E!important; } .ud975a8efb11c8dac451debd7b956fca8 .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .ud975a8efb11c8dac451debd7b956fca8 .ud975a8efb11c8dac451debd7b956fca8-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .ud975a8efb11c8dac451debd7b956fca8:after { content: ""; display: block; clear: both; } READ: caeser EssayI will always hope for a time where he forgives me for whatever it is I have done, and we can be brothers once more. The Sultans of Kabul, again. Until then, I will wait for him, and pray that he is safe.