metals
Yes, silver can be hammered into sheets, a process known as silver sheet metalwork. The metal is heated to make it more malleable, then hammered using a technique known as planishing to create thin, flat sheets.
no because oxygen cannot be hammered
The fact that it can be hammered into sheets would seem to be the most relevant characteristic in this case.
There are a number of metals that can be hammered into sheets, and gold is the best of them. It is the malleability of metal that allows it to be hammered thinly, and a link to that related question can be found below.
Malleability is the property that allows a material to be hammered into thin sheets without breaking.
An element that can be hammered is called malleable.
malleability
Gold
malleable can be hammered into thin sheets
Yes - depending on what you call "thin". Gold is capable of being hammered much thinner.
Malleability
Yes.