Apoint mutation that does not result in a change to the amino acid coded for is said to be a mutation.

The appropriate response is Silent mutation, a mutation in DNA that doesn't fundamentally modify the phenotype of the  organism in which they happen. Quiet changes can happen in non-coding districts, or they may happen inside exons.Hope this will help 

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.

You can look it up online and some images should pop up