![]() ![]() This would mean that indium’s atomic mass was actually 113, placing the element between two other metals, cadmium and tin. You can find it by searching for periodic table and. Because elemental indium is a silvery-white metal, however, Mendeleev postulated that the stoichiometry of its oxide was really In 2O 3 rather than InO. Google search now has an interactive periodic table you can check out to learn a lot more about the elements. ![]() If this atomic mass were correct, then indium would have to be placed in the middle of the nonmetals, between arsenic (atomic mass 75) and selenium (atomic mass 78). These five toxic, non-metallic elements make up group 17 and consist of: fluorine (F), chlorine (Cl), bromine (Br), iodine (I) and astatine (As). Should they be placed in separate slots in the periodic table Text Solution. The halogens are located in group 17 (formally known as group VIIA) on the left of the noble gases on the periodic table. Fluorine (the most electronegative element) is assigned a value of 4.0, and values range down to cesium and francium which are the least electronegative at 0.7. The Pauling scale is the most commonly used. The atomic mass of indium had originally been reported as 75.6, based on an assumed stoichiometry of InO for its oxide. Chlorine has been in use for thousands of years in other forms, but it wasnt named until 1810 by Sir Humphry Davy. The two isotopes of chlorine have atomic mass 35 u and 37 u. Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. He discovered, for example, that the atomic masses previously reported for beryllium, indium, and uranium were incorrect. When the chemical properties of an element suggested that it might have been assigned the wrong place in earlier tables, Mendeleev carefully reexamined its atomic mass. \): Comparison of the Properties Predicted by Mendeleev in 1869 for eka-Aluminum and eka-Silicon with the Properties of Gallium (discovered in 1875) and Germanium (discovered in 1886). ![]()
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