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[[Caesium]] is a [[Group 1]] [[element]], on the [[Periodic Table]], with an [[Atomic Number|atomic number]] of 55.
===About Caesium===
====Molecular Structure====
: [[Caesium]] has the [[Chemical Formula|chemical formula]] [[Caesium|Cs]].
: [[Caesium]] [[atom]]s join together in large numbers to form a giant [[metal]] [[molecule]].
====Atomic Structure====
: [[Caesium]] as 55 [[proton]]s and 78 [[neutron]]s in its [[Atomic Nucleus|nucleus]] giving it an [[Atomic Number]] of 55 and an [[Relative Atomic Mass|atomic mass]] of 133.
: An [[atom]] of [[Caesium]] has only 1 [[electron]] in its [[Outer Shell|outer shell]].
====Properties====
: [[Caesium]] is a more [[Reactivity|reactive]] [[Alkali Metal|alkali metal]] than [[Rubidium]] but less [[Reactivity|reactive]] than [[Francium]].
: [[Caesium]] is more [[Reactivity|reactive]] than [[Carbon]] on the [[Reactivity Series|reactivity series]] so it must be [[Extraction of Metals|extracted]] from its [[ore]] using [[electrolysis]].
: [[Caesium]] [[Chemical Reaction|reacts]] explosively with [[water]] to produce [[Hydrogen]] [[gas]] and [[Caesium Hydroxide]].
: [[Caesium]] is a [[solid]] at [[STP|room temperature]].
==Key Stage 4==
===Meaning===
[[Caesium]] is a [[Group 1]] [[element]], on the [[Periodic Table]], with 55 [[proton]]s in the [[Atomic Nucleus|nucleus]].
===About Caesium===
====Molecular Structure====
: [[Caesium]] has the [[Chemical Formula|chemical formula]] [[Caesium|Cs]].
: [[Caesium]] [[atom]]s join together in a [[Giant Metallic Structure|giant metallic structure]].
====Atomic Structure====
: 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]].
: [[Caesium]] [[ion]]s have lost an [[electron]] to become [[Positive Charged|positively charged]].
====Properties====
: [[Caesium]] is a more [[Reactivity|reactive]] [[Alkali Metal|alkali metal]] than [[Rubidium]] but less [[Reactivity|reactive]] than [[Francium]].
: [[Caesium]] is more [[Reactivity|reactive]] than [[Carbon]] on the [[Reactivity Series|reactivity series]] so it must be [[Extraction of Metals|extracted]] from its [[ore]] using [[electrolysis]].
: [[Caesium]] [[Chemical Reaction|reacts]] explosively with [[water]] to produce [[Hydrogen]] [[gas]] and [[Caesium Hydroxide]].
: [[Caesium]] is a [[solid]] at [[STP|standard temperature and pressure]] with a [[Melting Point|melting point]] of 28.5 [[Degrees Celsius|°C]].