Caesium or Cesium (version 1)

Caesium or Cesium (version 1) - Periodic Table of Videos

Introduction

This video from the "Periodic Table of Videos" series delves into the properties, handling precautions, and unique characteristics of the element cesium (also spelled caesium). The presenter highlights the element's reactivity, expense, and various physical properties.

Main Points

• Elemental Properties:

- Cesium is one of the heaviest alkali metals, situated near the bottom of Group 1 in the periodic table.

- It is highly reactive and must be handled with care.

- Cesium is notable for its gold color and its state can vary between liquid and solid depending on ambient temperature, as its melting point is around 27°C (close to room temperature).

• Handling and Storage:

- The cesium sample is stored in a glass ampoule under an argon atmosphere to prevent reactions with air and moisture.

- Handling cesium requires caution as it reacts vigorously with water, including perspiration from hands.

• Physical Characteristics:

- Due to its large atomic size, cesium exhibits interesting properties.

- The presenter demonstrates the flexibility of cesium bromide, a compound of cesium, by bending a piece of it, showcasing its malleability due to the large size of its atoms.

• Chemical Properties and Value:

- Cesium is expensive, with a conservative estimate valuing a sample between £1,000 and £1,500.

- The large atoms of cesium and bromine in cesium bromide make it an excellent material for transmitting infrared light, as the atoms vibrate slowly and do not absorb infrared light strongly.

Conclusion

The video provides an insightful look into the fascinating properties of cesium, emphasizing its unique physical and chemical characteristics, its practical applications, and the precautions necessary for safe handling. This elemental exploration underscores the complexity and beauty of cesium as a part of the periodic table.