My Element: Gold Origin of name: From the Old English word geolo (yellow) Symbol: Au Atomic Number: 79 Atomic Mass: 196.96655 amu Group/section: Gold is element number 79 found in group 11 period 6 Electron configuration: [Xe] 4f14 5d10 6s1 Valence electrons: 1 Physical or chemical properties: Color: gold Crystal Structure: Cubic Density at 293 K: 19.32 g/cm3 Melting Point: 1064.43 °C (1337.5801 K‚ 1947.9741 °F) Boiling Point: 2807.0 °C (3080.15 K‚ 5084.6 °F) Number of Neutrons: 118
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THIS IS A LEGACY SPECIFICATION H Thursday 26 January 2012 – Morning GCSE GATEWAY SCIENCE ADDITIONAL SCIENCE B B623/02 Unit 1 Modules B3 C3 P3 (Higher Tier) * B 6 2 0 7 6 0 1 1 2 * Candidates answer on the Question Paper. A calculator may be used for this paper. Duration: 1 hour OCR supplied materials: None Other materials required: • Pencil • Ruler (cm/mm) * B 6 2 3 0 2 * INSTRUCTIONS TO CANDIDATES • • • • • • Write your name‚ centre number
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Disappearing Spoon - Chapter 1: Geography is Destiny - Chapter 1 of The Disappearing Spoon discusses the importance of an element’s location on the periodic table based on the atomic number and type of material‚ and how this specific area determines its atomic “identity” and relation to other elements. This also includes the reactivity of elements based on their electron configurations. This relates directly to what we have studied in Chapter 5 of our textbook. One example from The Disappearing
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(einsteinium) has the atomic symbol of Es. Its atomic number is 99 while its atomic mass is 252. Einsteinium is located in period 7 of the periodic table as a part of the actinide series. It has 99 protons‚ 99 electrons‚ and 153 neutrons in its atoms. The physical appearance of einsteinium is not known‚ but it is predicted to be metallic and silvery white or grey. Einsteinium is classified as a metal and is a solid at room temperature. It has a melting point of 860°C and an atomic radius of approximately
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Purpose The purpose of the “Beanium” lab was to determine the average atomic mass of three different isotopes of beanium. During the lab beans were counted to determine mass of the sum of the beans. Each type of bean were weighed separately and then averaged together to determine the average atomic mass of beanium. Materials and Hazards Analytical balance‚ coffee filter‚ pencil‚ paper‚ cup‚ American beans‚ Nigerian beans‚ Mexican beans‚ calculator‚ and paper. Raw Data Bean Total Mass w/ Cup Number
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Triads. Later‚ A.E.Beguyer de Chancourtois arranged the elements according to their atomic mass and created the first geometrical representation of the periodic table. John Newlands proposed the Law of Octaves which states the elements repeat the chemical properties after every eighth element. Lothar Meyer and Demetriv Mendeleev published their own periodic table. Mendeleev arranged the elements in order of increasing atomic weight and grouped the elements of similar properties together. William Ramsay
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of three with related properties. He termed these groups "triads". In all of the triads‚ the atomic mass of the second element was almost exactly the average of the atomic weights of the first and third elements. | Alexandre-Emile Béguyer de Chancourtois | The first person to notice the periodicity of the elements — similar elements seem to occur at regular intervals when they are ordered by their atomic weights. He devised an early form of periodic table‚ which he called the telluric helix. |
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Water is made up of hydrogen and oxygen‚ H20. Mixtures – A combination of two or more pure substances. Example – Blood‚ butter‚ gasoline‚ soap‚ the metal in a ring‚ the air we breathe‚ and the Earth. 2.3 – What are the Postulates of Dalton’s Atomic Theory? Five Postulates 1. All matter is made up of very tiny‚ indivisible particles‚ which Dalton called atoms. 2. All atoms of a given element have the same chemical properties. Conversely‚ atoms of different elements have different chemical
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PRACTICE EXAMINATION QUESTIONS FOR 1.1 ATOMIC STRUCTURE (includes some questions from 1.4 Periodicity) 1. (a) Complete the following table. |Relative mass|Relative charge| Neutron||| Electron||| (2) (b) An atom has twice as many protons as‚ and four more neutrons than‚ an atom of 9Be. Deduce the symbol‚ including the mass number‚ of this atom. ..................................................................................................................................... (2) (Total
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name is In Greek‚ Phosphoros‚ which means bringer of light‚ but I prefer to be called by my English name Phosphorus‚ but for easier reasons you can call me P. I am pretty much at the beginning of the periodic table‚ thanks to my atomic number of 15. Wonder what’s an atomic number? It is basically the number of protons‚ which is my positive charge‚ that I contain at my nucleus. The nucleus does not only contain protons‚ but also neutrons‚ which will be important to know of and will talk about it soon
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