Difference between revisions of "Caesium"
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==Key Stage 3== | ==Key Stage 3== | ||
===Meaning=== | ===Meaning=== | ||
| − | [[File: | + | [[File:CaesiumSymbol1.png|right|300px|thumb|The [[Chemical Symbol|chemical symbol]] for [[Caesium]].]] |
[[Caesium]] is a [[Group 1]] [[element]], on the [[Periodic Table]], with an [[Atomic Number|atomic number]] of 55. | [[Caesium]] is a [[Group 1]] [[element]], on the [[Periodic Table]], with an [[Atomic Number|atomic number]] of 55. | ||
===About Caesium=== | ===About Caesium=== | ||
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==Key Stage 4== | ==Key Stage 4== | ||
| + | [[File:CsKS4.PNG|right|200px|thumb|The [[Chemical Symbol|chemical symbol]] for [[Caesium]].]] | ||
===Meaning=== | ===Meaning=== | ||
[[Caesium]] is a [[Group 1]] [[element]], on the [[Periodic Table]], with 55 [[proton]]s in the [[Atomic Nucleus|nucleus]]. | [[Caesium]] is a [[Group 1]] [[element]], on the [[Periodic Table]], with 55 [[proton]]s in the [[Atomic Nucleus|nucleus]]. | ||
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: The most [[Stable Isotope|stable isotope]] of [[Caesium]] has 78 [[neutron]]s in its [[Atomic Nucleus|nucleus]] giving it an [[Relative Atomic Mass|atomic mass]] of 133. | : The most [[Stable Isotope|stable isotope]] of [[Caesium]] has 78 [[neutron]]s in its [[Atomic Nucleus|nucleus]] giving it an [[Relative Atomic Mass|atomic mass]] of 133. | ||
: An [[atom]] of [[Caesium]] has only 1 [[electron]] in its [[Outer Shell|outer shell]]. | : An [[atom]] of [[Caesium]] has only 1 [[electron]] in its [[Outer Shell|outer shell]]. | ||
| − | : [[Caesium]] [[ion]]s have lost an [[electron]] to become [[Positive | + | : [[Caesium]] [[ion]]s have lost an [[electron]] to become [[Positive Charge|positively charged]]. |
====Properties==== | ====Properties==== | ||
: [[Caesium]] is a more [[Reactivity|reactive]] [[Alkali Metal|alkali metal]] than [[Rubidium]] but less [[Reactivity|reactive]] than [[Francium]]. | : [[Caesium]] is a more [[Reactivity|reactive]] [[Alkali Metal|alkali metal]] than [[Rubidium]] but less [[Reactivity|reactive]] than [[Francium]]. | ||
Latest revision as of 11:47, 5 March 2020
Contents
Key Stage 2
Meaning
Key Stage 3
Meaning
Caesium is a Group 1 element, on the Periodic Table, with an atomic number of 55.
About Caesium
Molecular Structure
- Caesium has the chemical symbol Cs.
- Caesium atoms join together in large numbers to form a giant metal molecule.
Atomic Structure
- Caesium as 55 protons and 78 neutrons in its nucleus giving it an Atomic Number of 55 and an atomic mass of 133.
- An atom of Caesium has only 1 electron in its outer shell.
Properties
- 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 oxidises extremely quickly in the presence of Oxygen so it must be stored in a completely sealed container.
- Caesium reacts explosively with water to produce Hydrogen gas and Caesium Hydroxide.
- Caesium is a solid at room temperature.
Key Stage 4
Meaning
Caesium is a Group 1 element, on the Periodic Table, with 55 protons in the nucleus.
About Caesium
Molecular Structure
- Caesium has the chemical symbol Cs.
- Caesium atoms join together in a giant metallic structure.
Atomic Structure
- The most stable isotope of Caesium has 78 neutrons in its nucleus giving it an atomic mass of 133.
- An atom of Caesium has only 1 electron in its outer shell.
- Caesium ions have lost an electron to become positively charged.
Properties
- 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 oxidises extremely quickly in the presence of Oxygen so it must be stored in a completely sealed container.
- Caesium reacts explosively 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.