Do pure metals form crystals? ...What determines their conductivity? the crystalline structure or the filled inner shells?
Metals, in general, are malleable and ductile; they are good reflectors of optical radiation and good absorbers of longer-wave radiation such as microwaves and radio waves; they are good conductors of heat and electricity. They form positive ions in combination. Most metals combine fairly easily with other (nonmetallic) elements; metals can dissolve in each other to form alloys.