Properties: Member of the Lanthanide Family Heat of Vaporization: 289 kJ/mol Molar Volume: 19.95 cm^3/mole Chemical Properties: Electronegativity: -1.13 (Pauling)‚ -1.07 (Allrod Ronchow) 9 isotopes All isotopes are radioactive Isotopes: 9 isotopes‚ although none of them are stableWho Discovered Your Element?: J.A. Marinsky‚ Lawerence Glendenin‚ and Charles D. CoryellWhat Year Was Your Element Discovered?: 1945What Was Your Element First Used For?: Nuclear powered
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dewees (vd866) – Exam review – dewees – (24127) This print-out should have 35 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Elements can be distinguished by their 1. hardness. 2. transparency. 3. dissolves in carbon disulfide 4. density of 2.07 g/ml 005 10.0 points Which of these substances I) table salt II) the liquid called coffee III) mercury is a mixture? 3. brittleness. 1. II and III only 4. density. 2. All
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1. What parameters can be used in the identification of this person? Forensic science is the uses scientific knowledge to solve legal and criminal investigations by collecting evidence from the crime scene. There are two main parameters that can be used to identify the individual in this case‚ namely forensic odontology and forensic anthropology. Forensic anthropology identifies human remains especially bones as they could locate and recover suspicious remains to help determine the age‚ sex‚ ancestry
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Etymology The name atom comes from the Greek ἄτομος (atomos‚ "indivisible") from ἀ- (a-‚ "not") and τέμνω (temnō‚ "I cut")‚[3] which means uncuttable‚ or indivisible‚ something that cannot be divided further.[4] The concept of an atom as an indivisible component of matter was first proposed by early Indian and Greek philosophers. In the 18th and 19th centuries‚ chemists provided a physical basis for this idea by showing that certain substances could not be further broken down by chemical methods
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Ayiana Diaz 10/30/17 Periodic Table Project Mrs. Foley: Period 1 Magnesium Magnesium is a major element. It’s the 7th ample element in the earth’s crust and the 8th most plenteous element in the universe and has diverse uses; some important and others impressive. Magnesium came from Magnesia‚ a district found in Greece. Magnesium was first discovered in 1755 by a scientist‚ Joseph Black. Black conducted an experiment in which he distinguished magnesium oxide from calcium oxide
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A) Isotopes of the same element differ only in the number of electrons they contain. B) An isotope of an atom with a larger number of neutrons is larger than an isotope of the same atom that contains fewer neutrons. C) Isotopes of the same element have the same mass. D) Isotopes of the same element don’t usually have the same properties. E) Some elements have 3 or more naturally occurring isotopes. Answer: E 3) Determine the number of protons‚ neutrons
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has three naturally occurring isotopes: argon-36‚ argon-38‚ and argon-40. Based on argon’sreported atomic mass‚ which isotope do you think is the most abundant in nature? Explain. 2. Copper is made of two isotopes. Copper-63 is 69.17% abundant and it has a mass of 62.9296 amu. Copper-65 is 30.83% abundant and it has a mass of 64.9278 amu. What is the weighted average mass of these two isotopes? 3. Calculate the atomic mass of silicon. The three silicon isotopes have atomic masses and relative
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Cited: "Chemistry Explained." Neon‚ Chemical Element. N.p.‚ n.d. Web. 24 Oct. 2012. . Dingrando‚ Laurel. "Electrons In Atoms." Chemistry: Matter and Change. New York‚ NY: Glencoe/McGraw-Hill‚ 2005. N. pag. Print. "The Element Neon[Click for Isotope Data]." It ’s Elemental. N.p.‚ n.d. Web. 24 Oct. 2012. . "The History of Neon Signs." About.com Inventors. N.p.‚ n.d. Web. 24 Oct. 2012. .
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some of the many uses of calcium‚ the element has much to tell about it’s family and classification. Calcium happens to be apart of the Alkali Earth Metals. The element has 20 electrons‚ 20 protons‚ and the number of neutrons in the most abundant isotope is 20. The element belongs to period number 4‚ and is apart of group number 2‚ and out of there being non-metals‚ metals‚ and metalloids‚ calcium happens to be a metal[Emsley]. Characteristics of Calcium- Calcium has much to tell about
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The Element Niobium Atomic Number: 41 Atomic Weight: 92.90638 Melting Point: 2750 K (2477°C or 4491°F) Boiling Point: 5017 K (4744°C or 8571°F) Density: 8.57 grams per cubic centimeter Phase at Room Temperature: Solid Element Classification: Metal Period Number: 5 Group Number: 5 Group Name: none What’s in a name? Named for the Greek mythological figure Niobe. Say what? Niobium is pronounced as ni-OH-bee-um. History
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