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Europium (Eu) 1. Basic Information Atomic Number 63 Symbol Eu Atomic Mass 151,964 u Category Rare ea...

Samarium (Sm) 1. Basic Information Atomic Number 62 Symbol Sm Atomic Weight 150.35 g/mol Category Ra...

Prometium (Pm) 1. Basic Information Atomic Number 61 Symbol Pm Atomic Weight 145 (most stable isotop...

Neodymium (Nd) 1. Basic Information Atomic Number 60 Symbol Nd Atomic Weight 144.242 g/mol Category ...

Praseodymium (Pr) 1. Basic Information Atomic Number 59 Symbol Pr Atomic Weight 140.91 g/mol Categor...

Serium 1. Basic Information Atomic Number 58 Symbol Ce Atomic Weight 140.12 g/mol Electron Configura...

Lantanum 1. Basic Information Atomic Number 57 Symbol La Atomic Weight 138.91 g/mol Category Rare ea...

Radium 1. Basic Information Atomic Number 88 Symbol Ra Atomic Weight 226.0254 g/mol Category Alkalin...

Barium (Ba) 1. Basic Information Atomic Number 56 Symbol Ba Atomic Weight 137.33 g/mol Category Alka...

Strontium 1. Basic Information Atomic Number 38 Symbol Sr Atomic Weight 87.62 g/mol Category Alkalin...