Period 3 Elements – Summary of Physical Properties Advanced Chemistry Book + website The elements in Period 3 of the periodic table are the elements sodium to argon. They represent the most straightforward trend in properties. As the atomic number of the elements increases across a period‚ the trend is from metallic to a non-metallic character. Electronegativity is a measure of an element’s ability to attract a shared electron pair to itself. Metals have a smaller electronegativity than 1
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A BRIEF HISTORY OF THE DEVELOPMENT OF PERIODIC TABLE Although Dmitri Mendeleev is often considered the "father" of the periodic table‚ the work of many scientists contributed to its present form. In the Beginning A necessary prerequisite to the construction of the periodic table was the discovery of the individual elements. Although elements such as gold‚ silver‚ tin‚ copper‚ lead and mercury have been known since antiquity‚ the first scientific discovery of an element occurred in 1649 when
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number of neutrons. c. The periodic table should be organized based upon atomic number. d. The periodic table should be organized based upon chemical properties. 2. What is significant about elements in the same group on the periodic table? (3.02) a. They have the same number of protons. b. They have the same number of electrons. c. They have the similar chemical properties. d. They are all noble gases. 3. As you go left to right across the periodic table‚ which of the following is true
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Discussion no. 2 The Nomenclature of Inorganic Compounds Discussion no. 3 The Periodic Table of Elements Sta. Maria‚ Yza Suaco‚ Trisha Marie T. Teves‚ Joan Marie Vale‚ Kate IN-9 Group 9 I. Introduction Representing molecules as images allows us to impart a great deal of information concerning molecular structure. But these molecules can also be named‚ and there are occasions when this is more convenient than drawing a picture. In the early days of chemistry‚ the list of known compounds
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sense of beauty and comfort from the periodic table of elements. The connection between Sacks and the periodic table is explained by Sacks himself in his article “Oliver Sacks: My Periodic Table.” When first read‚ the connection is not obvious much like Picabia’s painting‚ but once we see beyond the text‚ the connection can be seen. Written towards the inevitable end of his life‚ Sacks explains how he came to have the personal connection he has with the table. As humans‚ when we tend to suffer a
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Chapter 11 - The Periodic Table 11-1 Organizing by Properties Dmitri Mendeleev (1834-1907) russian‚ published his element classification in 1869 - increasing molar mass - matching similar properties Mendeleev’s periodic table included gaps - yet to be discovered - predicted the properties of missing elements repetition in properties of the elements was a fundamental pattern in nature - periodicity of the elements modern periodic law: the properties of the elements recur periodically when
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THIRD ROW OF THE PERIODIC TABLE INTRODUCTION The periodic table is a tabular display of the chemical elements‚ organized on the basis of their atomic numbers and chemical properties. Elements are presented in increasing atomic number. Elements with the same number of valence electrons are kept together in groups‚ such as the halogens and the noble gases. Due to this‚ there are gaps that form four distinct rectangular areas or blocks. The f-block is not included in the main table‚ but rather is
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Education University of Malaya Topic of Research: Development and Evaluation of Humanism Elements in teaching and learning ‘Periodic Table of Elements’ among Form 4 students Prepared by: LIM PEI LEE (PGJ 110010) Post Graduate for Master in Education (Science Education) Semester 2‚ Session 2011/2012‚ Education Faculty‚ University of Malaya. Table of Contents |No. |Contents |Page(s)
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first discovered by Sir Humphrey Davy in 1807. This element is the 11th element found on the periodic table; located in group 1 and period 3. Its chemical symbol is Na and it is classified as a metal. Metals‚ by definition‚ means that they are elements that are luster‚ lose electrons very easily‚ malleable‚ ductile‚ and are great conductors of heat and electricity. Sodium is found in group 1 of the periodic table because the electronegativity of sodium is very low. This allows it to form cations by giving
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Experiment Five – Group Chemistry The Alkaline Earths and the Halogens: Two Families in the Periodic Table Prelaboratory Questions 1. All of the common noble gases are monatomic and low-boiling. Their boiling points in °C are: Ne‚ –245; Ar‚ –186; Kr‚ –152; Xe‚ –107. Using the Periodic Table‚ predict as best you can the molecular formula and boiling point of radon‚ the only radioactive element in this family. _______________________ ____________________°C Molecular Formula
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