Write the symbol of element mercury.

Explanation

To write the symbol of the element mercury, follow these steps:

1. **Understand what an element is**: An element is a pure substance that cannot be broken down into simpler substances by chemical means. It is a fundamental building block of matter.

2. **Identify mercury as a chemical element**: Mercury is recognized as a chemical element with unique properties, such as being a good conductor of electricity and being the only liquid metal at room temperature.

3. **Learn the convention for chemical symbols**: The symbol of a chemical element is typically derived from its name, usually using the first letter or the first two letters. However, there are exceptions.

...