To answer which of the following elements is a nonmetal, I need to know which elements are being referred to.

However, here's some information that can help you identify nonmetals:

• Nonmetals: Generally, nonmetals are located on the right side of the periodic table.
• Common Nonmetals: Some common examples of nonmetals include:
  • Hydrogen (H)
  • Carbon (C)
  • Nitrogen (N)
  • Oxygen (O)
  • Fluorine (F)
  • Chlorine (Cl)
  • Sulfur (S)
  • Phosphorus (P)
  • Selenium (Se)
  • Iodine (I)
  • Noble Gases (Helium, Neon, Argon, Krypton, Xenon, Radon)
• Properties of Nonmetals:
  • Poor conductors of electricity and heat
  • Can be solids, liquids, or gases at room temperature
  • Do not have a metallic luster
  • Brittle in their solid form

If you provide a list of elements, I can identify the nonmetal(s) for you.