Where is fluorine used

Other groups with specific names are the pnictogens (group 15), chalcogens (group 16), halogens (group 17), and the noble gases (group 18, also known as inert ... ... halogens according to their position in the periodic table belong to Group VIIA, which means they have seven valence electrons and need an additional ... Page 1. 1. H. Hydrogen. 1.008. 11. Na. Sodium. 22.989. 19. K. Potassium. 39.098. 37. Rb. Rubidium. 85.468. 55. Cs. Cesium. 132.905. 87. Fr. Francium. Jan 6, 2014 ... This graphic looks at the halogens, found in Group 7 of the Periodic Table. This group consists of the elements fluorine, chlorine, bromine, iodine and ... Why are they so reactive? Halogens are so reactive, because they have 7 valence electrons, and are very close to having a complete shell of 8 electrons. The ... ... halogens such as chlorine, fluorine, bromine and iodine, elements belonging to Group 17 of the periodic table and, once in contact with fire, they emit ... Alkaline earth metals are the 2nd column on the table. All of them are silvery metals, have 2 extra electrons, react with halogens (scroll down some) to make ... Dimitri Mendeleev (1834- 1907) invented the first periodic table. He arranged the elements by their increasing atomic masses. Elements with similar properties ... Periodic Table and Trends playlist: Halogens. NEXT LECTURE. Periodic Table and Trends. Halogens. Back to Atomic Structure and Molecules · Chalcogen's and Noble ... Jun 6, 2015 ... Electron affinities of the chalcogens and halogens · The general trend for electron affinity down the group is that it decreases because of the ...