Caesium
Contents
Key Stage 2
Key Stage 3
Meaning
File:CaesiumSymbol.png
The chemical symbol for Caesium.
Caesium is a Group 1 element with an atomic number of 55.
About Caesium
- Caesium has the chemical formula Cs.
- Caesium as 55 protons and 78 neutrons in its nucleus giving it an Atomic Number of 55 and an atomic mass of 133.
- Caesium is a more reactive alkali metal than Rubidium but less reactive than Francium.
- Caesium is more reactive than Carbon on the reactivity series so it must be extracted from its ore using electrolysis.
- Caesium reacts strongly with water to produce Hydrogen gas and Caesium Hydroxide.
- Caesium is a solid at room temperature.
- An atom of Caesium has only 1 electron in its outer shell.
- Caesium ions have lost an electron to become positively charged.
Key Stage 4
Meaning
Caesium is a Group 1 element with 55 protons in the nucleus.
About Caesium
- Caesium has the chemical formula Cs.
- The most stable isotope of Caesium has 78 neutrons in its nucleus giving it an atomic mass of 133.
- Caesium is a more reactive alkali metal than Rubidium but less reactive than Francium.
- Caesium is more reactive than Carbon on the reactivity series so it must be extracted from its ore using electrolysis.
- Caesium reacts strongly with water to produce Hydrogen gas and Caesium Hydroxide.
- Caesium is a solid at standard temperature and pressure with a melting point of 28.5 °C.
- An atom of Caesium has only 1 electron in its outer shell.
- Caesium ions have lost an electron to become positively charged.