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You are giving an unknown element that dull in color. All you have to identify it is an electrical source and a meter that detects electrical charges. You would know it is a nonmetal if you turn on the electrical source and

Respuesta :

Metals conduct electricity while nonmetals do not. Therefore if when you turn on the electrical source and the devise indicates a current, you know the substance is a metal. If you turn on the electrical source and the devise indicates no current, the substance is a nonmetal. I hope this helps. Let me know if anything is unclear.