Investigation 1. Complete the following chart as you work through the investigation. Atomic Number Element Symbol Element Name Number of Protons Number of Electrons Mass Number Number of Neutrons Electron Configuration 18 ArArgon181840222‚ 8‚ 85932610138114171547111216 2a) Now rearrange the chart above so that the elements appear in order of their atomic number and as they appear on the periodic table. Atomic NumberElement SymbolElement NameNumber of ProtonsNumber of Electrons Mass NumberNumber
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Beryllium Beryllium is a stolid and atomic number 4. Beryllium atomic mass is 9.012182. Beryllium electrons pre shell are 1‚ 2. Beryllium is a chemical element with the symbol of Be. Beryllium was discovered by Louis Nicolas Vauquelin in 1797. Beryllium metal point is 2‚348 F. Beryllium is a steel gray and hard metal that is brittle. The discovery of beryllium was Louis Nicolas Vauquelin. Louis discovered beryllium in 1797. The place beryllium was discovered was in France. The metal was isolated
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4. postulated the quantum atom nucleus 5. discovered the proton electrons 6. father of atomic theory Dalton 7. location of most of the mass of the atom Bohr 1. unlike charges attract 2. like charges repel 3. charge on a neutron nonmetals 4. location of an electron periodicity shell 5. low ionization energies noble gases 6. repeating nature of atomic structure neutral 7. least reactive family True and Faults (6 points) A gamma ray is a
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Section Assignment 3.1: Determining Atomic Mass Instructions Perform the following calculations. Take care 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
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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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What is a chemical reaction? Can it be separated afterwards? 16) What is the law of conservation of mass? The mass of products has to _____ the mass of reactants. Chapter 5: 17) ______ are little‚ basic particles that make up matter. 18) Dalton’s Atomic Theory: I. All elements composed of ______. II. Atoms of the same element are ______. The atoms of one element are different from those of any other element. III. Atoms of different elements can physically mix together or can chemically combine
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Marinsky. It’s a metal‚ and named after the Greek God Prometheus. It is not naturally occurring‚ but can survive outside of a lab. Promethium has an atomic number of 61‚ which is the number of protons. Its atomic mass‚ protons+neutrons‚ is 145u. It is an isotope. This means that it has a different number of neutrons (84) than the number of electrons and protons (61). Every element changes states of matter at different temperatures. Promethium melts at 1042.0°C (1315 Kelvin)‚ boils at 3000.0°C
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bEAN BAG ISOTOPES:ABUNDANCE AND ATOMIC MASS LAB By: Catriona Whalley Partner: Ming Siegel Due: 1.14.10 Prelab A new atomic theory‚ in which all atoms of the same element are identical to one another and equal in mass‚ was proposed by the scientist Dalton. Although the theory had its flaws and was simple‚ it was revolutionary. Scientists became able to study the actual structure and mass of atoms after the discovery of radioactivity. Soon‚ isotopes were discovered‚ as atoms of the same element
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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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PASTE INTO A WORD DOCUMENT 1. What information would you need to calculate the atomic mass of an atom? The atomic number‚ the number of neutrons and add the numbers together. This is the atomic mass. 2. What information would you need to determine the atomic number of an atom? The number of protons in the nucleus of the atom. 3. Chlorine (Cl) has 17 electrons‚ 17 protons‚ and 18 neutrons what is the atomic mass of Cl? 34 4. What is the charge of the above Cl atom? Neutral If it gains
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