(above) silver #1 atoms arranged in a face centred cubic pattern
silver: precious metal whose atoms are arranged in closely packed hexagonal layers. First and fourth layers are in line with each other. This gives what is known as a face centred cubic pattern or cubic close packing. Silver is the best electrical conductor. It also conducts heat better than any other element.
Image is 500 pixels across, the originals are 4096 pixels across.