Which of the following property is generally found in non-metals?
🔬 Understanding the Core Differences: Metals vs. Non-Metals
Elements on the periodic table are broadly classified as metals, non-metals, and metalloids based on their physical and chemical properties. The question asks for a property that is characteristic of non-metals, which are fundamentally different from metals in how they behave.
Metals are characterized by their ability to deform plastically (change shape without breaking) and their excellent ability to conduct heat and electricity.
Non-Metals (in their solid state) are typically poor conductors and lack the ability to deform plastically. When a force is applied, they tend to fracture or shatter.
⚖️ Detailed Analysis of the Properties
Let's examine each property to see whether it applies to metals or non-metals.
(d) Brittleness
Definition: The tendency of a material to fracture or break with little to no plastic deformation when subjected to stress.
Applies to: This is a hallmark property of solid non-metals. Think of a piece of coal (carbon) or a stick of sulfur; if you hit them with a hammer, they shatter into pieces rather than bending. Therefore, brittleness is a general property of non-metals.
(a) Ductility
Definition: The ability to be drawn into thin wires.
Applies to: This is a classic property of metals, like copper and gold. Non-metals are not ductile; they would snap if you tried to pull them into a wire.
(b) Malleability
Definition: The ability to be hammered or pressed into thin sheets.
Applies to: This is another classic property of metals, like aluminum and gold. Non-metals are not malleable; they would crumble into powder if hammered.
(c) Conductivity
Definition: The ability to conduct heat and electricity.
Applies to: Metals are excellent conductors due to their sea of delocalized electrons. Non-metals are generally poor conductors (insulators). The main exception is graphite (a form of carbon), but as a general rule, non-metals are not conductive.
💡 Study Tips for Material Properties
- Metals are Bendy and Shiny: As a simple rule, think of metals as being malleable, ductile, conductive, and having a metallic luster.
- Non-Metals are Brittle and Dull: Think of solid non-metals as being the opposite: brittle, non-conductive, and generally dull in appearance.
- "Brittle" rhymes with "Little" deformation: A brittle material shows very little bending or stretching before it breaks.