S* Semiconductor/ Rare earth elements 반도체 원료- 단결정 실리콘/게르마늄/갈륨비소(GaAs/갈륨비소인/질화갈륨/탄화규소 **테리--리튬켈/코발트/망가니즈/알루미늄 > IInformation technology 정보기술

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Semiconductor elements are primarily found in columns IV and some of column VI of the periodic table. The most common semiconductor elements are silicon (Si) and germanium (Ge), both belonging to column IV. Other elemental semiconductors include tin (Sn) in column IV, and selenium (Se) and tellurium (Te) in column VI. Additionally, several compound semiconductors are formed by combining elements from different groups, such as gallium arsenide (GaAs) and indium phosphide
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Rare earth elements (REEs) include 17 elements: the 15 lanthanides, plus scandium and yttrium. These are:
Lanthanides:
Lanthanum (La), Cerium (Ce), Praseodymium (Pr), Neodymium (Nd), Promethium (Pm), Samarium (Sm), Europium (Eu), Gadolinium (Gd), Terbium (Tb), Dysprosium (Dy), Holmium (Ho), Erbium (Er), Thulium (Tm), Ytterbium (Yb), and Lutetium (Lu).
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Rare-earth element
Lithium · Beryllium · Sodium ; Sodium · Magnesium · Potassium ; Potassium · Calcium · Rubidium ; Rubidium · Strontium ; Caesium · Barium · Lanthanum ...

https://en.wikipedia.org/wiki/Rare-earth_element
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