Question

Does any metal float?

Answer 1

1. Normally materials that are denser than water (they have more mass per unit volume), such as metals will sink.
2. In order to float , something just needs to have less density than water . Water is $1\mathrm{g}\mathrm{per}{\mathrm{cm}}^3$ , so anything less than that will float.
3. There are three metals that are light enough to do this, lithium, sodium and potassium , however , they are also highly reactive and basically explode when they touch water.