Yttrium is a chemical element. It is any of a subgroup of rare-earth elements, of which the cerium and terbium metals comprise the other two subgroups. It constitutes a silvery-metallic transition aluminous chemically like to the lanthanoids and has historically been classified as a infrequent land element.
Yttrium is the first d-block element in the fifth period. The most important use of yttrium is in making phosphors, such as the red ones used in television receiver cathode irradiate subway showings and inwards LEDs.
Chemically, yttrium resembles these elements more closely than its neighbor in the periodic table, scandium, and if its physical properties were plotted against atomic number then it would have an apparent number of 64.5 to 67.5, placing it between the lanthanides gadolinium and erbium.
Other uses include the production of electrodes, electrolytes, electronic filters, lasers and superconductors; various medical applications; and as traces stylish various materials to enhance their properties.
Yttrium is a soft, silver-metallic, lustrous and highly crystalline transition metal in group 3.
As expected by periodic trends, it is less electronegative than its predecessor in the group, scandium, more electronegative than its successor in the group, lanthanum, and less electronegative than the next member of period 5, zirconium.
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