Iron

Iron is a chemical element with the symbol Fe and atomic number 26. It is a metal in the first transition series. It is the most common element on Earth by mass, forming much of Earth's outer and inner core. Iron is the fourth most common element in the Earth's crust.

Physical Properties of Iron

• Melting Point: 1,538°C
• Boiling Point: 2,862°C
• Density: 7.87 g/cm³
• Hardness: 4 on the Mohs scale
• Color: Silvery-gray

Chemical Properties of Iron

Iron readily forms compounds with a wide range of elements, including carbon, sulfur, and oxygen. It reacts with oxygen in the air to form iron oxide, commonly known as rust.

Uses of Iron

Iron is used in a variety of applications, including:

• Construction and infrastructure
• Automobile manufacturing
• Steel production
• Machinery and equipment
• Tools and utensils

Study Guide

To study and understand the topic of iron, it is important to focus on the following key points:

1. The physical and chemical properties of iron
2. The role of iron in the Earth's core and crust
3. The industrial and commercial uses of iron
4. The extraction and production of iron and its alloys
5. The environmental impact of iron and its compounds

It is also recommended to explore the historical significance of iron and its impact on human civilization, as well as its role in biological systems.