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After his theorisation like 15 years before, it was discovered.
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After his theorisation 20 years before, it was discovered.
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Discovered nearly 30 years after his therisation it has been really important for physics.
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like most of them, this element was discovered a while after his theorisation.
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They where theorised and discovered the same time, theorised ten years before the discovery.
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It's the last discovered element and the one that has need more time to find since his theorisation.