The Earth may be some kind of rare, but is it a kind of rare that rules out life and intelligence on other worlds?

You say Earth has "just the right combination of elements". Yes, the combination of elements found on Earth is just fine for the forms of life that have emerged on Earth... How could it not be?

Even in this solar system, there may be one or more other worlds that have just the right combination of elements for something that lives there. After we've had a better look at worlds like Europa, Enceladus, and Titan, not to mention Venus, we'll likely be in a better position to assess how abiogenesis and evolution can or can't work on the planets and moons in other systems.