>>12968106You can find that out on your own. Google exists.
But what's so odd about it and what's coincidental? You have to use the word coincidence correctly first. There's nothing to compare it to which would make it coincidental.
Is it odd to you or coincidental that hydrogen has 1 proton 1 electron? Hopefully you answer no to that. Is it coincidental that water is abundant on Earth and it "just so happens" that we drink it to survive? Nope. Same deal with the moon.