Which Chemical Element, With Atomic Number 85, Is The Rarest Naturally-Occurring Element In The Earth's Crust, Appearing Only As A Decay Product From Various Heavier Elements? It Is The Least Reactive Halogen For Which Data Is Available.'''

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1. Which Chemical Element, With Atomic Number 85, Is The Rarest Naturally-Occurring Element In The Earth's Crust, Appearing Only As A Decay Product From Various Heavier Elements? It Is The Least Reactive Halogen For Which Data Is Available.'''