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==Key Stage 2=====Meaning===[[Calcium]] is a [[metal]] found in our [[bone]]s.==Key Stage 3==[[File:CalciumSymbol1.png|right|300px|thumb|The [[Chemical Symbol|chemical symbol]] for [[Calcium]].]][[File:Ca-40_WK.PNG|right|200px|thumb|A 2 dimensional representation of a [[Calcium]] [[atom]] with 20 [[proton]]s and 20 [[neutron]]s in the [[Atomic Nucleus|nucleus]] and 20 [[electron]]s orbiting the [[Atomic Nucleus|nucleus]].]]===Meaning===[[Calcium]] is a [[Group 2]] [[element]], on the [[Periodic Table]], with an [[Atomic Number|atomic number]] of 20.===About Calcium=======Molecular Structure====: [[Calcium]] has the [[Chemical Symbol|chemical Symbol]] [[Calcium|Ca]].: [[Calcium]] [[atom]]s join together in large numbers to form a giant [[metal]] [[molecule]].====Atomic Structure====: [[Calcium]] as 20 [[proton]]s and 20 [[neutron]]s in its [[Atomic Nucleus|nucleus]] giving it an [[Atomic Number]] of 20 and an [[Relative Atomic Mass|atomic mass]] of 40.: An [[atom]] of [[Calcium]] has only 2 [[electron]]s in its [[Outer Shell|outer shell]].====Properties====: [[Calcium]] is a more [[Reactivity|reactive]] [[Alkali Earth Metal|alkali earth metal]] than [[Magnesium]] but less [[Reactivity|reactive]] than [[Strontium]].: [[Calcium]] 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]].: [[Calcium]] [[Chemical Reaction|reacts]] strongly with [[water]] to produce [[Hydrogen]] [[gas]] and [[Calcium Hydroxide]] and strongly with [[acid]] to produce [[Calcium]] [[salt]]s.: [[Calcium]] is a [[solid]] (at [[Room TemperatureSTP|room temperature]]) . ==Key Stage 4==[[metalFile:CaKS4.PNG|right|200px|thumb|The [[Chemical Symbol|chemical symbol]] for [[Calcium]].]][[File:Ca-40_WK.PNG|right|200px|thumb|A 2 dimensional representation of the [[Bohr Model]] of a [[Calcium]]-40 [[isotope]] with 20 [[proton]]s and 20 [[neutron]]s in the [[Atomic Nucleus|nucleus]] and 2 [[electron]]s in the first [[Electron Orbital|shell]], 8 in the second, 8 in the third and 2 in the [[Outer Shell|outer shell]].]]===Meaning===[[Calcium]] is a [[Group 2]] [[element]] , on the [[Periodic Table]], with 20 [[proton]]s in the [[Atomic Nucleus|nucleus]].===About Calcium=======Molecular Structure====: [[Calcium]] has the [[Chemical Symbol|chemical symbol]] [[Calcium|Ca]].: [[Calcium]] [[atom]]s join together in a [[Giant Metallic Structure|giant metallic structure]].====Atomic Structure====: The most [[Stable Isotope|stable isotope]] of [[Calcium]] has 20 [[neutron]]s in its [[Atomic Nucleus|nucleus]] giving it an [[Relative Atomic Mass|atomic mass]] of 40.: An [[atom]] of [[Calcium]] has only 2 [[electron]]s in its [[Outer Shell|outer shell]].: [[Calcium]] [[ion]]s have lost two [[electron]]s to become [[Positive Charge|positively charged]].====Properties====: [[Calcium]] is a more [[Reactivity|reactive]] [[Alkali Earth Metal|alkali earth metal]] than [[Magnesium]] but less [[Reactivity|reactive]] than [[Strontium]].: [[Calcium]] 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]].: [[Calcium]] [[Chemical Reaction|reacts]] strongly with [[water]] to produce [[Hydrogen]] [[gas]] and [[Calcium Hydroxide]] and strongly with [[acid]] to produce [[Calcium]] [[salt]]s.: [[Calcium]] is a [[solid]] at [[STP|standard temperature and pressure]].