Lesson 3.01: History of the Periodic Table 1. Explain how scientific observations led to the development of‚ and changes to‚ the periodic table. Dmitri Mendeleev- first periodic table‚ organized 63 known elements according to properties‚ organized into rows and columns. He wrote names‚ mass and chemical properties on each. Julius lothar Meyer- independently worked in German ‚ similar to Mendeleev Henry Gwyn Jeffrey’s Moseley: worked with Ernest Rutherford experimented with 38 metals‚ he found that
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Explore key information about the chemical elements through this periodic table | Group | 1 | 2 | | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | Period | | 1 | 1H1.008 | | 2He4.0026 | 2 | 3Li6.94 | 4Be9.0122 | | 5B10.81 | 6C12.011 | 7N14.007 | 8O15.999 | 9F18.998 | 10Ne20.180 | 3 | 11Na22.990 | 12Mg24.305 | | 13Al26.982 | 14Si28.085 | 15P30.974 | 16S32.06 | 17Cl35.45 | 18Ar39.948 | 4 | 19K39.098 | 20Ca40.078 | | 21Sc44.956 | 22Ti47.867 | 23V50.942 |
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DEVELOPMENT OF THE PERIODIC TABLE Although Dmitri Mendeleev is often considered the "father" of the periodic table‚ the work of many scientists contributed to its present form. Elements such as gold‚ silver‚ tin‚ copper‚ lead and mercury have been known since earliest times. In 1649 the first scientific discovery of an element occurred. Hennig Brand‚ a German chemist‚ treated urine to a series of processes that resulted in the production of the element phosphorus. Over the next 200 years
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Development of the periodic table ➢ The elements in the periodic table have been arranged in the order of the number of protons (a.k.a. atomic number) The next significant stage in the development of the periodic table was discovered by came from John Newlands. He arranged the known elements in order of their atomic masses. He introduced the ‘law of octaves’ which meant that every eighth element had similar properties. As it didn’t work for all the known elements it was therefore dismissed
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It is in the d-block and it is a transition metal. Technetium is in the 7th group in the periodic table because it has 1 electron on its last shell. Also it is in the 5th period in the periodic table because it has 5 shells. Number of energy levels of Technetium is 5. Its electron shells are 2‚8‚18‚14‚1 as it is in the picture. Firstly‚ Russian chemist Dmitri Mendeleev‚ who is the creator of the periodic table‚ predicted Technetium’s existence. He called it eka-manganese because there was a missing
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The Periodic Table Notes History of the Periodic Table * Two main contributors * Dmitri Mendeleev * Henry Moseley Dmitri Mendeleev – Russian * 1869: published his periodic table with the 63 known elements * Arranged the first periodic table in order of increasing atomic masses Henry Moseley – British * 1913 revised Mendeleev’s periodic table * Today’s periodic table * Arranged in order of increasing atomic numbers What is the difference between Mendeleev’s
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Periodic Table Trends When you think of a periodic table‚ you think of elements like oxygen‚ neon‚ lead‚ and iron. You may even think of numbers‚ rows‚ and columns. You may not think about trends that are happening throughout a periodic table. There are many different trends that go on in a periodic table. The trends that I am going to be describing throughout this paper are atomic mass‚ atomic radius‚ first ionization energy‚ and electronegativity. When you study a normal/ordinary periodic
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CSEC CHEMISTRY NOTES ON PERIODIC TRENDS From Chemistry for CSEC by Tania Chung-Harris and Mike Taylor Chemistry for CAPE by Susan Maraj and Arnold Samai Periodic Trends in Group II Elements in Group II The elements in Group II are called alkaline earth metals. Be‚ Mg‚ Ca‚ Sr‚ Ba‚ Ra Beryllium‚ Magnesium‚ Calcium‚ Strontium‚ Barium‚ Radium These elements bond by metallic bonds (intramolecular forces) to form giant metallic structures. The size of the
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The Periodic Properties of Atoms The Periodic Table: In the 1870’s‚ the Russian chemist Mendeleev developed the periodic table‚ based upon the relationship between the atomic weights of the elements and their chemical properties. As one ascends from lightest to heaviest elements‚ there is a periodic recurrence of chemical properties. For example‚ the elements with atomic numbers 2‚ 10‚ 18‚ 36‚ 54‚ and 86 all are chemically inert (the noble gases)‚ while those with atomic numbers one greater 3‚ 11
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Periodic Table of the Elements I 1. 1 1 2 H H He II 1.00794 3 2. 4. 5. 6. Li Be 9.012182 IV V VI 1.00794 4.002602 5 6 7 8 9 10 N O F Ne B C 10.811 12.0107 13 14 15 Si P 12 Na Mg Al 22.989770 24.3050 26.981538 14.00674 15.9994 18.9984032 20.1797 16 28.0855 30.973761 17 18 S Cl Ar 32.066 35.4527 39.948 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Br Kr 39.0983
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