what are the isotopes of helium
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Explanation:
Although there are nine known isotopes of helium (2He) (standard atomic weight: 4.002602(2)), only helium-3 (3
He
) and helium-4 (4
He
) 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:
Element “Helium” has two stable isotopes (3He and 4He) and six radioactive ones (5He, 6He, 7He, 8He, 9He, and 10He).
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