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Atom
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==Key Stage 3==
===Meaning===
An [[atom]] is a very small [[particle]] made of [[proton]]s, [[neutron]]s and [[electron]]s that can join with other [[atom]]s to make [[molecule|molecules]] and is considered the smallest part of an [[element]].
:Singular [[Noun]]: '''Atom'''
===About Atoms beyond The Dalton Model===
: [[Atom]]s are made of three smaller [[particle]]s; the [[proton]], [[neutron]] and [[electron]].
: [[Proton]]s and [[neutron]]s are found in the [[Atomic Nucleus|nucleus]] at the centre of an [[atom]]. [[Electron]]s are found [[Electron Orbital|orbiting]] the [[Atomic Nucleus|nucleus]] in 'shells'.
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: In an [[atom]] the number of [[electron]]s is always the same as the number of [[proton]]s in the [[Atomic Nucleus|nucleus]].
: Different [[atom]]s can have different numbers of [[proton]]s and [[neutron]]s.
: The simplest [[atom]] is [[Hydrogen]] which has 1 [[proton]] and 1 [[electron]] and no [[neutron]]s.
==Key Stage 4==
===Meaning===
An [[atom]] is a very small [[particle]] made of [[proton]]s, [[neutron]]s and [[electron]]s that can join with other [[atom]]s to make [[molecule|molecules]] and is considered the smallest part of an [[element]].
===About Atoms===
====The Bohr Model of the Atom====
: In 1913 [[Neils Bohr]] added to the [[Nuclear Model]] when he proposed that [[electron]]s could only [[orbit]] the [[Atomic Nucleus|nucleus]] in specific [[Electron Orbital|electron orbitals]] or 'shells' creating the [[Bohr Model]] of the [[atom]].
====The Addition of the Proton====
: In 1919 [[Ernest Rutherford]] determined that the [[Hydrogen]] [[Atomic Nucleus|nucleus]] was present in all [[Atomic Nucleus|atomic nuclei]]. This introduced the [[proton]] to the model of the [[atom]].
====The Addition of the Neutron====
: In 1932 [[James Chadwick]] discovered a [[Neutral Charge|neutral]] [[Subatomic Particle|subatomic particle]] which he named a [[Neutron]]. This [[neutron]] explained the existence of [[isotope]]s and completed out modern understanding the model of the [[atom]] studied at GCSE.====The Electron Cloud====: ''NB: You don't need to know this'' The model of the [[atom]] was soon updated by [[Werner Heisenberg]] who determined that the exact position and velocity of [[electron]]s could not be known and so they do not '[[orbit]]', rather they exist in a cloud of probable locations around the [[Atomic Nucleus|nucleus]].
====Extra Information====