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[[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 FormulaSymbol|chemical formulaSymbol]] [[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 [[STP|room temperature]].
==Key Stage 4==
===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 FormulaSymbol|chemical formulasymbol]] [[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 Charged|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]].