Metals are malleable and are great conductors of heat and electricity. Non-metals are brittle and are bad conductors of heat and electricity. Metalloids are either brittle or malleable and can be good conductors of heat and electricity or not.

Physical Properties of Metals Metals are lustrous, malleable, ductile, good conductors of heat and electricity.

In chemistry, a nonmetal (or non-metal) is a chemical element that mostly lacks the characteristics of a metal. Physically, a nonmetal tends to have a relatively low melting point, boiling point, and density.

Summary of Common Properties

• High ionization energies.
• High electronegativities.
• Poor thermal conductors.
• Poor electrical conductors.
• Brittle solids—not malleable or ductile.
• Little or no metallic luster.
• Gain electrons easily.
• Dull, not metallic-shiny, although they may be colorful.

(ii) Ductility , the ability to be drawn out into a wire…. (iii) Thermal conductivity , the ability to conduct heat…. (iv) Electrical conductivity , the ability to conduct electricity…. (v) Chemical reactivity , metals tend to be good reducing agents…….

• Good electrical conductors and heat conductors.
• Malleable – can be beaten into thin sheets.
• Ductile – can be stretched into wire.
• Possess metallic luster.
• Opaque as thin sheet.
• Solid at room temperature (except Hg).

Three properties of metals are:

• Luster: Metals are shiny when cut, scratched, or polished.
• Malleability: Metals are strong but malleable, which means that they can be easily bent or shaped.
• Conductivity: Metals are excellent conductors of electricity and heat.

Physical Properties of Metals:

• Metals can be hammered into thin sheets.
• Metals are ductile.
• Metals are a good conductor of heat and electricity.
• Metals are lustrous which means they have a shiny appearance.
• Metals have high tensile strength.
• Metals are sonorous.
• Metals are hard.

Physical properties of metals include:

• Corrosion resistance.
• Density.
• Melting point.
• Thermal properties.
• Electrical conductivity.
• Magnetic properties.

Chemical Properties of Metals

• The density of metals is usually high.
• Metals are malleable and ductile.
• Metals form an alloy with other metals or non – metals.
• Some metals react with air and corrode.
• Metals are good conductors of heat and electricity.
• Generally, metals are in a solid state at room temperature.

Access Answers to Science NCERT Class 8 Chapter 4 Materials: Metals and Non-Metals

1. Metals: Those materials which possess the characteristic of being hard, shiny, malleable, fusible, ductile, etc. are termed as metal. Few examples of metals are iron, gold, silver, aluminium, copper, etc.

Very Short Answer Type Questions Answer: Metal is a substance which is lustrous, sonorous, ductile, and is a good conductor of heat and electricity. Answer: Metals can be drawn into thin wires.

Examples of metals are aluminium, copper, iron, tin, gold, lead, silver, titanium, uranium, and zinc. Well-known alloys include bronze and steel.

mercury

Metals are arranged on the left side of the periodic table and there are five kinds of metals: Alkaline earth metals, Alkali metals, Transition metals, Actinides and Lanthanides. There are a total 92 elements out of which 70 are metals.

Of these 118 elements, 94 occur naturally on Earth. Six of these occur in extreme trace quantities: technetium, atomic number 43; promethium, number 61; astatine, number 85; francium, number 87; neptunium, number 93; and plutonium, number 94.

About 75% of all the known chemical elements in the world are categorized as metals. However, there are five distinct types of metals found on the Periodic Table of Elements. According to the Royal Society of Chemistry, there are 94 metals listed on the Periodic Table.

Low carbon steel

The elements can be classified as metals, nonmetals, or metalloids. Metals are good conductors of heat and electricity, and are malleable (they can be hammered into sheets) and ductile (they can be drawn into wire).