相關字詞組
最近查詢過的單字

天火字典

英英字典: atomic_number_21

atomic number 21   (TTS Sound)



Overview of noun atomic_number_21

The noun atomic number 21 has 1 sense


  • scandium, Sc, atomic number 21 -- (a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite)

返回 →