创建字典 建立一个新字典： # A tome of elements and their symbolselements = {'Hydrogen': 'H', 'Helium': 'He', 'Lithium': 'Li'} 2. 添加或更新条目 ...

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National Periodic Table Day, observed annually on February 7, honors one of the most significant achievements in scientific ...

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The facility will convert imported green ammonia into hydrogen for industrial decarbonisation, power generation and supplying refuelling stations across the ...

The chemical element palladium has the symbol Pd and atomic number of 46 ... medicine, dentistry, hydrogen purification, electronics and jewelry. Approximately 40% of palladium production comes ...

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