Question

any isotope of helium​

Answer 1

Answer:

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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Answer 2

Explanation:

Helium » isotope data Helium: isotope data. Helium has two isotopes but it consists almost entirely of He-4 with natural He only containing just over 0.0001% of He-3. Thousands of liters of He-3 are used annually in cryogenic applications and He-3 is also used as a neutron counter in nuclear application.