Gold: A Precious Element

Gold is a chemical element with the symbol Au (from Latin: aurum) and atomic number 79. It is a dense, soft, shiny, and highly sought-after metal that has been valued and used by humans for thousands of years.

Physical and Chemical Properties of Gold

Appearance: Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal.
Melting Point: Its melting point is 1,064°C (1,947°F), and its boiling point is 2,700°C (4,892°F).
Chemical Symbol: Au
Atomic Number: 79
Atomic Mass: 196.9665

Occurrences and Extraction

Gold is relatively rare in the earth's crust, but it occurs in various natural forms such as nuggets, grains, and veins. It is often found in association with quartz, pyrite, and other minerals. The extraction of gold from the earth is typically done through mining, a process that involves the use of heavy machinery and chemicals to separate the gold from the surrounding rocks and minerals.

Uses of Gold

Gold has been used for various purposes throughout history, including:

Jewelry: Gold is highly valued for its use in making jewelry and decorative items due to its lustrous appearance and resistance to tarnishing.
Financial and Monetary Use: Gold has been used as a form of currency and a standard for monetary systems throughout history.
Electronics: Gold is an excellent conductor of electricity, making it valuable for use in electronics and technology.
Medical Applications: Gold is used in certain medical treatments and as a component in some medical devices.

Study Guide

Here are some key points to remember about gold:

Gold is a chemical element with the symbol Au and atomic number 79.
It is a dense, soft, shiny metal with a slightly reddish yellow color.
Gold is relatively rare in the earth's crust and is often found in association with other minerals.
It has been used for making jewelry, as a form of currency, in electronics, and in certain medical applications.
The extraction of gold from the earth is typically done through mining.

Now that you have learned about gold, take some time to review the information and explore the various uses and properties of this precious metal.

◂Science Worksheets and Study Guides Fourth Grade. Classifying organisms

Study Guide

Classifying organisms

Worksheet/Answer key

Classifying organisms

Worksheet/Answer key

Classifying organisms

Worksheet/Answer key

Classifying organisms

Vocabulary/Answer key

Classifying organisms

Vocabulary/Answer key

Classifying organisms

Vocabulary/Answer key

Classifying organisms

Vocabulary/Answer key

Classifying organisms

The resources above cover the following skills:

The Living Environment: Students understand that cells are the basic unit of life, that all life as we know it has evolved through genetic transfer and natural selection to create a great diversity of organisms, and that these organisms create interdependent webs through which matter and energy flow. Students understand similarities and differences between humans and other organisms and the interconnections of these interdependent webs.

Biodiversity: Students compare living things based on their behaviors, external features, and environmental needs.

Describe how living things can be sorted in many ways, depending on which features or behaviors are used to sort them, and apply this understanding to sort living things.