Question

unit 5 comprehensive quiz l
which elements are examples of nonmetals?
barium, iron, cobalt
argon, sulfur, oxygen
silicon, germanium, astatine
sodium, potassium, calcium

Explanation:

• Barium, iron, cobalt: These are metals. Metals are generally good conductors of heat and electricity, have a metallic luster, and are malleable and ductile.
• Argon, sulfur, oxygen:
• Argon (\(Ar\)) is a noble gas (a type of non - metal). Noble gases are chemically inert (under normal conditions).
• Sulfur (\(S\)) is a non - metal. It is brittle, a poor conductor of heat and electricity, and has a non - metallic appearance.
• Oxygen (\(O\)) is a non - metal. It is a gas at room temperature, a poor conductor of heat and electricity.
• Silicon, germanium, astatine: Silicon (\(Si\)) and germanium (\(Ge\)) are metalloids (elements with properties intermediate between metals and non - metals). Astatine (\(At\)) is a metalloid (although its classification can be a bit more complex due to its rarity and radioactivity, but it is not a typical non - metal).
• Sodium, potassium, calcium: These are alkali metals (sodium and potassium) and an alkaline earth metal (calcium). They are all metals, with typical metallic properties like high thermal and electrical conductivity, malleability, etc.

Answer:

Argon, sulfur, oxygen