<P> Indium is a chemical element with symbol In and atomic number 49 . It is a post-transition metal that makes up 0.21 parts per million of the Earth 's crust . Very soft and malleable , indium has a melting point higher than sodium and gallium , but lower than lithium and tin . Chemically , indium is similar to gallium and thallium , and it is largely intermediate between the two in terms of its properties . Indium was discovered in 1863 by Ferdinand Reich and Hieronymous Theodor Richter by spectroscopic methods . They named it for the indigo blue line in its spectrum . Indium was isolated the next year . </P>
<P> Indium is a chemical element with symbol In and atomic number 49 . It is a post-transition metal that makes up 0.21 parts per million of the Earth 's crust . Very soft and malleable , indium has a melting point higher than sodium and gallium , but lower than lithium and tin . Chemically , indium is similar to gallium and thallium , and it is largely intermediate between the two in terms of its properties . Indium was discovered in 1863 by Ferdinand Reich and Hieronymous Theodor Richter by spectroscopic methods . They named it for the indigo blue line in its spectrum . Indium was isolated the next year . </P>
what group is indium in on the periodic table
what group is indium in on the periodic table
post-transition metal
post-transition metal