Honestly, we will never know. If the atomic weight of hydrogen would have been as much as 1/1000 of 1% different life would not have evolved as we know it. For me it is a matter of faith. But if the Big Bang is accurate then statistically speaking most planets will have basically the same elemental compisition. The seeds of life would be planted everywhere.
Woodie Westbrook
I came, I saw, I compiled.