Which of the answer choices is a true statement? select all that apply. metallic elements usually exist as molecules, combining with atoms of themselves. metallic elements can exist on their own as individual atoms. nonmetals usually exist as molecules, combining with atoms of themselves. nonmetals can exist on their own as individual atoms.

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?