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19 (jiǎ) 20 (gài) 21 (kàng)

 


 
  • (jiǎ, ㄐㄧㄚˇ) potassium K, alkali metal 鹼性金屬|碱性金属 with atomic number 19 [CE-DICT]
  • (gài, ㄍㄞˋ) calcium Ca, alkaline earth, atomic number 20 [CE-DICT]
  • (kàng, ㄎㄤˋ) scandium Sc, transition metal, atomic number 21 [CE-DICT]
 


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