Properties and Categories of Elements

This lesson explores the classification of elements into metals, non-metals, and metalloids. Metals are characterized by properties such as luster, ductility, malleability, and high conductivity. Non-metals, in contrast, are brittle, dull, and poor conductors. Metalloids exhibit properties of both metals and non-metals, making them useful as semiconductors. The lesson also discusses the reactivity of certain metals and the practical applications of these elements in everyday life.

What are the three main categories of elements in the periodic table?

• Metals, Non-metals, and Metalloids

• Conductors, Insulators, and Semiconductors

• Solids, Liquids, and Gases

• Reactive, Non-reactive, and Inert

Which property allows metals to be drawn into wires?

• Conductivity

• Ductility

• Malleability

• Luster

Which metal is known for its high reactivity with water?

• Iron

• Gold

• Potassium

• Copper

Why is copper commonly used for electrical wiring?

• It is shiny and attractive

• It is very heavy

• It is inexpensive and has low reactivity

• It is a poor conductor of electricity

What is the term for the ability of a metal to be hammered into thin sheets?

• Conductivity

• Ductility

• Malleability

• Luster

Which of the following is NOT a property of metals?

• Poor conductivity

• Malleability

• High melting points

• Luster

Which of the following is a property of non-metals?

• They have high melting points

• They are brittle

• They are good conductors of electricity

• They are shiny

In which state of matter do most non-metals exist?

• Plasma

• Solid

• Liquid

• Gas

What is a characteristic of metalloids?

• They are highly reactive with water

• They are excellent conductors of electricity

• They have properties of both metals and non-metals

• They are always dull

Which element is a typical example of a metalloid used in electronics?

• Iron

• Silicon

• Gold

• Oxygen