Now, with the help of dot structures, we will surround the atoms by their valence electrons.ĭo you know that the elements present in the main groups of the periodic table have a tendency to form an eight-electron arrangement in their valence shell following noble gas configurations? This is how we have placed the nitrogen in the center surrounded by the two O atoms. Nitrogen is the least electronegative element between the two, hence N will be the central atom. Now, to find out which atom will act as a central one, we have to look at Pauling’s Electronegativity chart. Total valence electron number in NO2 = 5 + 6*2 Oxygen belongs to group 16 ( or group 6) and has an atomic number of 8, therefore a valency of 6. Nitrogen belongs to group 15( or group 5) and has an atomic number of 7, therefore has a valency of 5. Let us talk about drawing the Lewis Structure for Nitrogen Dioxide ( NO2 ).Ī molecule of nitrogen dioxide consists of one nitrogen atom and two atoms of oxygen. This is a limited theory on chemical bonding nature and electronic structure but provides a simple viewpoint towards the formation of any molecular composition. Lewis Structure is a diagrammatic representation of any given molecule with the help of the constituent atoms and the position and arrangement of electrons to form bonds and lone pairs. The electrons in the outermost shell which determine the valency are known as valence electrons. Inside an atom, we have the positively charged nucleus surrounded by electrons in their shells forming a negatively charged cloud.
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