![]() Note that each of these entries corresponds to one of the twelve periods respectively. Group six (R H superscript two, R 0 superscript three) contains the following information: (no entry for period 1), O = 16, S = 32, C r = 52, S o = 78, M o = 96, T o = 125, -, -, W = 184, -, U = 240. 3.2), is the most convenient and widely used. A modern version, the so-called long formof the Periodic table of the elements (Fig. Some forms emphasise chemical reactions and valence, whereas others stress the electronic configuration of elements. Group five (R H superscript two, R superscript two 0 superscript five) contains the following information: (no entry for period 1), N = 14, P = 31, V = 51, A s = 75, N b = 94, S b = 122, -, -, T a = 182, B l = 208, -. Numerous forms of Periodic Table have been devised from time to time. Group four (RH superscript four, R0 superscript eight) contains the following information: (no entry for period 1), C = 12, B i = 28, T i = 48, - = 72, Z r = 90, S n = 118, ? C o = 140, ? L a = 180, P b = 207, T h = 231. Group three (-, R superscript one 0 superscript nine) contains the information: (no entry for period 1), B = 11, A l = 27, 8. Note the ach of these entries corresponds to one of the twelve periods respectively. The second group (-, R 0) contains the following information: (not entry for period 1) B o = 9, 4, M g = 24, C a = 40, Z n = 65, S r = 87, C d = 112, B a = 187, -, -, H g = 200,. The International Union of Pure and Applied Chemistry (IUPAC) confirmed the names of elements 113, 115, 117, and 118 as: Nihonium (symbol Nh), for element 113. Group 2: The alkaline earth metals, such as beryllium, magnesium, and calcium, are also good conductors. The periodic table is a masterpiece of organised chemical information and the evolution of chemistrys periodic table into the current form is an astonishing achievement. Figure B shows the first periodic table developed by Mendeleev, which had eight groups and twelve periods. The elements that are generally good conductors of electricity belong to the following groups on the periodic table: Group 1: The alkali metals, such as lithium, sodium, and potassium, are highly conductive. (credit a: modification of work by Serge Lachinov credit b: modification of work by “Den fjättrade ankan”/Wikimedia Commons) Figure A shows a photograph of Dimitri Mendeleev. \): (a) Dimitri Mendeleev is widely credited with creating (b) the first periodic table of the elements.
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