Which Alkali Metal, With The Atomic Number 87, Is The Second-Rarest Naturally-Occurring Chemical Element On Earth? It Is Also The Second-Most Electropositive Element, After Caesium [See-Zee-Um].'''

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1. Which Alkali Metal, With The Atomic Number 87, Is The Second-Rarest Naturally-Occurring Chemical Element On Earth? It Is Also The Second-Most Electropositive Element, After Caesium [See-Zee-Um].'''