what are the isotope of helinm
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Although there are nine known isotopes of helium, only helium-3 and helium-4 are stable. All radioisotopes are short-lived, the longest-lived being ⁶ He with a half-life of 806.7 milliseconds. The least stable is ⁵ He , with a half-life of 7.6×10⁻²² s, although it is possible that ² He has an even shorter half-life.
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Although there are nine known isotopes of helium, only helium-3 and helium-4 are stable. All radioisotopes are short-lived, the longest-lived being ⁶ He with a half-life of 806.7 milliseconds. The least stable is ⁵ He , with a half-life of 7.6×10⁻²² s, although it is possible that ² He has an even shorter half-life.
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