化學命名原則（修訂） Principles of Chemical Nomenclature, PRC revision, 1951

Academia Sinica / Ministry of Education, PRC

Mainland revision adding the first transuranic elements 鎿 鈈 鎇 錇 鐦.

Forms attested here (5)

• 鎿 Neptunium Np ná today 镎 ná survives
• 鈈 Plutonium Pu bù today 钚 bù survives
• 鎇 Americium Am méi today 镅 méi survives
• 錇 Berkelium Bk péi today 锫 péi survives
• 鐦 Californium Cf kāi today 锎 kāi simplified to 锎 rather than 钘, to avoid the wine vessel 鈃 survives