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hydrogen 1 i would assume. the atomic weight fo hydrogen is 1.00794, so the 2 and 3 must have very little to no effect on the atomic weight, so 1 would be like 99+% and the other two would be like >.5% each.

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15y ago
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Q: Which isotope of hydrogen is most abunant hyrogen1 hydrogen2 or hydrogen3 and why?
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