Placement Of Hydrogen On The Periodic Table

519 words - 3 pages

Carter FrenchMs. GrandChemistry 1Due 9/30/14Periodic Element Justification Research ProjectThe element hydrogen, has been correctly placed on the periodic table in large part because its ionization energy, electronegativity, and Valence electrons align with general periodic trends.In 1766, the element Hydrogen was officially recognized as a distinct element largely due to the research done by Henry Cavendish. Hydrogen was the first element to form in the universe. All other elements formed from hydrogen. Hydrogen is the most abundant element in the visible universe. Hydrogen is the first element in the periodic table because of its one proton and one ...view middle of the document...

39 EV. This data corresponds with the general trend of ionization energy increases bottom to top.Electronegativity is the measure of the tendency of an atom to attract a valence electron. The general trend for electronegativity is the increase from bottom to top. This is one of the least clear trends on the periodic table because of the nonstandard way of measuring electronegativity. Hydrogen has a 2.1 on the Pauling scale for electronegativity. The element bellow hydrogen is lithium which has 1 on the Pauling scale. This makes sense because electronegativity increases bottom to top.Valence electrons are the electrons on the farthest shell of the atom. They are also the driving force between all chemical reactions. The general trend for valence electrons is an increase from left to right. This is true because the number of protons increase left to right so each atom has the same number of electrons to protons. Hydrogen has 1 valence electron while the element left of hydrogen is helium which has two valence electrons. This makes sense because 2 is larger than 1.The element hydrogen was correctly placed on the periodic table because of its ionization energy which is 13.598 EV, Its Electronegativity which is 2.1 on the Pauling scale, and its Valence electrons which was 1. Hydrogen was first discovered in 1766 by Henry Cavendish, and is the most abundant element in the visible universe.Citations"Periodic Trends."-Chemwiki.N.P.,n.d.Web.29 Sept. 2014"The Element Hydrogen." Its Elemental -.N.p., n.d. Web. 29 Sept. 2014

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