A lighter than air metal with the approximate density of water?

I’ve been pondering lighter-than-air metals in terms of transportation, and it got me to thinking about metals in general. What if you had a metal with a density about that of water? If such a thing existed, it would certainly have methodical warfare applications, but just to elaborate on the idea I’m thinking a lighter-than-air metal would be basically in the ballpark of the same density as lead, but less so because of course if it’s lighter than air it must be. But since lead is so dense, the lightness of air would compensate for the weight.<br><br>But in terms of science fiction, what if you had a metal with a density equal to that of water? It would fit neatly in the middle of the great divide between airmetals and all other metals. They would have to be synthetic since such an alloy cannot naturally occur, but what would such a metal be like?<br><br>I’m not a chemist so I don’t know the first thing about creating such an alloy, other than that it doesn’t exist. But perhaps such a metal could be created by mixing in water as part of the process, which would add water molecules into the alloy, thus lightening its overall density. How would that work, you’d need to maintain the water molecule’s structure and ensure that said water molecules bond with the metal, which would require only the most complex and advanced particle accelerators.<br><br>What if such a metal did exist? What kind of applications would it have? It could be used for airmetals, of course, but it might be more expensive than regular steel. It would also have all the properties of water, perhaps it could be affected by changing temperatures or somehow impaired by water itself. You could have a metal of this kind that’s only stable at room temperature, and would begin to degrade or rust if it got too hot or too cold, it would be useless in extreme environments but would be super useful in more moderate environments. What do you think?<br><br>Edit: Thanks for all the responses, everybody’s great and I appreciate all your passion and engagement. I am going to say that I’m not familiar with all the different metals you’ve mentioned in the comments, but it’s not about making the alloy with those metals, it’s about creating one from scratch. So I think I’ve been incorrectly assuming that such a metal can be made by mixing the right alloys, when in reality I’m thinking of a metal alloy that exists independently of known metals. If I wanted to create a synthetic alloy from scratch, I’d need to create the metal itself, then add the water atoms, then somehow make sure the water bonds with the metal. That sounds like a highly complex process, but the end result would be a metal that’s literally fused with water, keeping the properties of water while maintaining the strength of a metal. This process would probably require the kind of advanced particle accelerators that are currently beyond our technology.<br><br>@Paintingbird of course I could create a metal alloy using one of those metals, but the premise behind the thought experiment is creating such a metal from scratch using a particle accelerator. You need to create the metal first and then add the water atoms, and then somehow make the water atoms bond with the metal atoms. That sounds like a highly complex and advanced process.