tantalum-180

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tantalum-180

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naturally-occurring tantalum

In tantalum
012 percent, is tantalum-180, which has the unusual property of being found in its excited state. The tantalum-180 excited state has a half-life of more than 1.2 × 10¹⁵ years; the ground state (the lowest energy state) has a half-life of only 8.154 hours.
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