Table Completion:

Alkali Metals
| Element | Symbol | Atomic Number |
|---------|--------|---------------|
| Lithium | Li | 3 |
| Sodium | Na | 11 |
| Potassium | K | 19 |
| Rubidium | Rb | 37 |
| Cesium | Cs | 55 |

Explanation:
- Alkali Metals: Alkali metals are a group of chemical elements in the periodic table that have similar properties. They are soft, shiny, highly reactive metals, and are typically found in nature as compounds rather than pure elements.
- Element: This column lists the specific alkali metal element being discussed, such as lithium, sodium, potassium, rubidium, and cesium.
- Symbol: The symbol column gives the chemical symbol for each alkali metal element, which is a shorthand way to represent the element in chemical equations and discussions.
- Atomic Number: The atomic number is the number of protons in the nucleus of an atom of the element. It uniquely identifies each element, and alkali metals have atomic numbers ranging from 3 (lithium) to 55 (cesium).
- Properties: Alkali metals are known for their low melting points, high reactivity with water and air, and ability to form ionic compounds. They are used in various industrial applications, such as in batteries, fireworks, and the production of certain chemicals.
- Trends: As you move down the alkali metal group in the periodic table, the reactivity of the elements increases due to the outermost electron being farther from the nucleus. This trend is known as the alkali metal reactivity trend.

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