1 18 IUPAC Periodic Table of the Elements 1 H 2 He helium hydrogen [1.007; 1.009] 2 3 4 Li beryllium 9.012 11 14 15 16 17 4.003 5 atomic number Be lithium [6.938; 6.997] 13 Key: 6 7 8 9 10 O F Ne boron carbon nitrogen oxygen fluorine neon [10.80; 10.83] B [12.00; 12.02] [14.00; 14.01] [15.99; 16.00] 19.00 20.18 12 13 14 15 16 17 18 Na
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The Impact of Communism The government in the 1940’s used communism as the reason to spend lots of money and instill a sense of constant fear in American’s. In one of the opening lines of the “Atomic Cafe” Harry S. Truman was stating that the military had already spent 2 billion dollars “on the greatest scientific gamble in history”. There was an abundance of media that was being televised and published that showed communism as an extreme and controlled society that was led by one evil
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Atomic Structure Worksheet Name: Period: 1. Name the three particles of the atom and their respective charges are: a. b. c. 2. The number of protons in one atom of an element determines the atom’s ‚ and the number of electrons determines of an element. 3. The atomic number tells you the number of in one atom of an element. It also tells you the number of in a neutral atom of that element. The atomic
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periodic table in 1928. How the periodic table is organized: Charles Janet’s periodic table was organized according all elements that had been discovering before 1928 according to the orbital filling. It also structures the electrons in ascending atomic order Describe the information the periodic table contains: DISADVANTAGE: * The periodic table has a rough tarnation from metal to none-metal. DISADVANTAGE: * The periodic table has a rough tarnation from metal to none-metal. ADVANTAGES:
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Matthew Rose Mr. Schwartz Chemistry 8 March 2011 Ernest Rutherford Ernest Rutherford was one of the most famous physicists of the early 20th century. He won the Nobel Prize in chemistry in 1908 for his work on atomic emissions and his contributions that led to the discovery of atomic fission. Ernest Rutherford was born in Nelson‚ New Zealand on August 30‚ 1871. His father was James Rutherford and his Mother was Martha Thompson. His father was a wheelwright‚ a person who builds and repairs wheels
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to science were the quantitative justification of the previously empirical concept of atomic number‚ and Moseley’s law. This law advanced chemistry by immediately sorting the elements of the periodic table in a more logical order. It also advanced basic physics by providing independent support for the Bohr model of the Rutherford/Antonius Van den Broek nuclear atom containing positive nuclear charge equal to atomic number. Niels Henrik David Bohr (pronounced [nels ˈb̥oɐ̯ˀ] in Danish; 7 October 1885
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nucleus Number of neutrons = (protons & neutrons) mass number – atomic number #26 – 28 are key points 26. What distinguishes the atoms of one element form the atoms of another? Elements are different because they contain different numbers of protons. 27. How do the isotopes of a given element differ from one another? Isotopes of an element have different numbers of neutrons‚ they also have different mass numbers. 28. How is atomic mass calculated? Multiply the mass of each isotope by its
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......................................................4 Johann Wolfgang Döbereiner Periodic Table The periodic table is a chart used in chemistry that shows chemical elements in order of their atomic number. Three of the people which contributed to the final production of the periodic table‚ are Dmitri Mendeleev John Newlands Johann Wolfgang Döbereiner Dmitri Mendeleev February 8‚ 1834 in Tobolsk‚ a town in Siberia‚ Russia.
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arranged the 63 elements known at the time into a Periodic Table based on atomic mass. This was then published in Principles of Chemistry in 1869. His first Periodic Table was put together by arranging the elements in ascending order of atomic weight and grouping them by the similarity of properties. He even predicted that other elements existed‚ and left space open for them. Mendeleev also provided for variance of atomic weight order‚ and he predicted three yet to be discovered elements including
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investigation was to find the average atomic mass for the element Beanium with three isotopes. The average atomic mass is the average mass of the atoms of the element divided by the total number of atoms. An isotope is an atom with the same number of protons‚ but different number of neutrons; they are different forms of a single element. Since we knew the isotopes had almost the same amount of sub-atomic particles‚ we made our hypothesis the following: If the sub-atomic particles are almost exact in amount
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