appear at regular intervals. 2- The most common element in the universe is‚ 3- The common alloy Brass is made of and 4- An ion with a negative charge is call a‚ Question III: Fill in the tables below: (14pts‚ 2 points each) Electron configuration Group# Period # Na | | | | Al | | | | S | | | | N | | | |
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is a metal. Europium is about as hard as lead and is quite ductile. It is the most reactive of the rare earth metals‚ and reacts quickly when exposed to air. It resembles Calcium when reacted with water. It’s classified in the 6th row of the periodic table which is lanthanum. The rare element is not common in America and is usually found where it was made. With europium I believe it because most of the things that are made of europium have some type of an accent or unusual way to say or spell it
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(kJ/mol): 868.1 Electronegativity: 2.28 Natural Occurring Isotopes: Six stable isotopes of platinum occur in nature (190‚ 192‚ 194‚ 195‚ 196‚ 198). Information on three additional radioisotopes is available (191‚ 193‚ 197). Location on the periodic table: -Transition Metals section. -10th group/family. -5th period. History of element: -It’s difficult to assign credit for the discovery. Ulloa 1735 (in South America)‚ Wood in 1741‚ Julius Scaliger in 1735 (Italy) all can make claims. Platinum
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Electronegativity (Pauling Scale) of the First 20 Elements: - Electronegativity increases down a period‚ as the ability of the element to attract an electron increases. Because there are more protons on the right side of the periodic table‚ there is a higher effective nuclear charge‚ enabling the element to more easily attract electrons. - Electronegativity decreases when going down a group‚ as more shells are added‚ causing the effective nuclear charge to decrease. This causes
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CHEMISTRY 110 GENERAL CHEMISTRY I INFORMATION SHEET Fall 2011 Instructors: Professor Ashok Kakkar Otto Maass Chemistry Building‚ room 313 Tel: (514) 398-6912 Office hours: By appointment‚ e-mail via WebCT to arrange meetings. E-mail: use webCT Professor Scott Bohle Otto Maass Chemistry Building‚ room 233A Tel: (514) 398-7409 Office hours: By appointment‚ e-mail via WebCT to arrange meetings E-mail: use webCT Professor Bryan Sanctuary Otto Maass Chemistry Building‚ room 224 Tel: (514) 398-6930
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I think reading is the most beneficial activities which human beings can do. Through the reading one can understand the enviroment which surrounds him‚ can discover inventions and can explain the miracle’s of the world. Many readings help you to be smarter. As proverb goes “Reading makes a full man‚ meditation a profoundmMan‚ discourse a clear man”. Reading is not just only information it is also relaxing. As Ricarde Steele said:”Reading is to the mind what exercise is to the body”. Is it really
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Discuss the impact of Alchemy on the modern science of Chemistry. At the first time human being have found gold - a rare and the most valuable element in the world‚ people are attracted by its shiny and glowing appearance. They are trying to find different ways turning those ordinary base metals into worthy gold. This kind of transformation process started at the Middle Ages‚ named as Alchemy‚ was the initiation of the modern science of Chemistry. Alchemy is a difficult and complicated subject
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my trip to shimla was the best man!! we had so much of fun in shimla and also great Essays for Science: Chemistry Building Blocks of Science THE periodic table of the elements—the 96 metals‚ nonmetals and gases that form everything in the material universe— is the blueprint of the atomic future... Calorimetry: Specific Heat and Heat of Solution Summary These experiments were conducted to find the specific heat of a metal as well as the heat of solution of a solid. Both experiments required
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electrons. A) 2 B) 6 C) 8 D) 10 E) 36 12. The electron configuration of a ground-state Ag atom is __________. A) [Kr]5s24d10 B) [Kr]5s14d10 C) [Ar]4s24d9 D) [Kr]5s23d9 E) [Ar]4s14d10 13. In general‚ as you go across a period in the periodic table from left to right: (1) the atomic radius __________; (2) the electron affinity becomes __________ negative; and (3) the first
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Purpose: The purpose of this experiment was to observe and record the halogens’ (NaF‚ NaCl‚ NaBr‚ and KI) reactions with the chemicals Ca(NO3)2‚ AgNO3‚ and NH4OH and use these observations to identify an unknown halogen. Data: (see next page) TABLE 1: REACTIONS OF HALOGENS WITH CA(NO3)2‚ AGNO3‚ AND NH4OH REACTION NAF NACL NABR KI REACTION W/ CA(NO3)2 solution turns cloudy and precipitate forms clear precipitate formed slightly cloudy precipitate formed no reaction REACTION
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