Ametal melts at 450°c. is this property of the metal classified as chemical or physical ? explain your choice

Chemical properties describe how things undergo chemical reactions, while physical properties describe how things behave when they're not undergoing reactions.

In the case of melting a metal, the melted metal continues to be the same material - just in a liquid rather than a solid form.  As a result, melting (and all phase changes, for that matter) is a physical change and the ability of the metal to melt at 450 degrees is a physical property.

The metal is named first