potassium without realizing it. The main two uses were for soap and potash‚ which is a potassium compound formed by burning wood. Also during this time‚ people did not pick up on any distinctions between potassium and sodium‚ deeming them as the same element. In 1807‚ Sir Humphrey Davy discovered a difference in the two‚ therefore finding potassium. Thanks to this discovery‚ we now use potassium for a variety of things‚ such as liquid detergents‚ low-sodium salt‚ oxidizing agents‚ fireworks‚ fertilizers
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days. The New Periodic Table with Rubric Included The New Periodic Table Dmitri Mendeleev created the periodic table on March 6‚ 1869 (almost 100 years‚ to the day‚ before my birthdayJ) based on the atomic weights of the elements. Many elements were missing then‚ but he left spaces for them because he thought one day they might be discovered. Now the periodic table is arranged by the element’s atomic number and many other trends from it can provide valuable information to scientists
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The element I chose for this paper was Tin. Tin got its name because it is Anglo-Saxon‚ and the atomic symbol get its name from the Latin root Stannum. https://education.jlab.org/itselemental/ele050.html. What does Tin mean? Tin belongs to the carbon family https://www.britannica.com/science/tin. Tin consists of 50 Protons‚ 69 Neutrons and 50 electrons. (my citation for where i got this information is the periodic table you gave to us.) The atomic number of tin is 50 because the atomic number is
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My element is Lutetium and number 71 on the periodic table. It is the last of the lanthanide series and the rarest and most expensive of the series. Lutetium is always found with rare earth metals and it is very hard to separate from other rare elements. This is why it cost $10‚000 per kilogram. The lanthanide series is a series of metallic elements and is a part of the rare earth metals. Lutetium is silvery white and shiny. Of the rare earth metals it is the hardest and densest. Lutetium was
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Properties and applications of Materials Assignment 2 Task 1 (P1) I. Describe the structure including the atomic structure of the element copper. Copper has a symbol Cu. It is a metal with a very high thermal and electrical conductivity. Pure copper is soft and malleable when it is freshly exposed the surface has a reddish-orange colour. It has an atomic mass of 63.546 g.mol -1 and an atomic number of 29. The electrons per energy level for copper go 2‚8‚18‚1. Copper has an atomic number of 29‚ thus
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Science quiz review 1. Recall safety rules of a science lab. (WHMIS) a. 2. List examples of elements‚ mixtures‚ and compounds. a. Elements: hydrogen; oxygen; iron; zinc‚ Mixtures: sea water; crude oil‚ Compounds: water; sugar; salt 3. Compare and contrast the properties of elements‚ mixtures and compounds. a. Elements consist of a single kind of atom; They have unique‚ fixed properties; They cannot be separated into simpler unique substances. Compounds consist of two or more kinds
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Sample Calculations None Discussion and Comments This experiment tested the theory that the elements in the periodic table are arranged in a manner in which the elements of a group share similar chemical properties. The elements we used were the ones from the alkaline earth metal group. These elements tend to form 2+ cations and are very reactive. We also compared these elements to that of lead because lead also forms a 2+ cation. We used the chemical property of solubility to observe
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to give answers with the appropriate units and significant figures. Show your solution method clearly. The use of a Periodic Table will be required. 1. Element "E" (not a real symbol for an element)‚ has three naturally occurring isotopes: 60% 228E‚ 25.0% 222E‚ and 15.0% 232E. Use this information to determine the atomic mass of element "E". Atomic Mass = (0.60 x 228g/mol) + (0.25 x 222g/mol) + (0.15 x 232g/mol) = 227.1g/mol (Actinium) 2. Calculate the approximate percent abundance
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Chromium has an atomic number of 24 and is located in the 6th group‚ 4th period of the periodic table of elements. Chromium is a metal and can be identified by its atomic symbol of Cr. Chromium is a hard and brittle metal‚ making it hard to bend as it would break if one tried to do so. Chromium is also a shiny and lustrous metal with a grey color to it. Chromium may also be identified by its high melting and boiling point and can prove to be very useful in everyday lives. Chromium was first discovered
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Element name-Helium Element Symbol-He Atomic number-2 Group name or number- Part of the noble gases in group 18 Atomic mass (to nearest thousandth)-4.003 Number of protons-2 Number of neutrons-2 Number of electrons-2 Number of valence electrons-2 List of isotopes-He3 and He4 Electron Configuration-1s2 Discovered By-Pierre Janssen Year discovered-1868 Circumstances of discovery- Janssen discovered helium in 1868 when he was looking in a telescope when he found the yellow spectrum lines of helium
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