Identify items in your life that are made of each type of element: metal, nonmetal, and metalloid. for each item, explain why the properties of that type of element are necessary for the function of that item.

metal: spoon
nonmetal:
metalloid:

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th