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Created page with "==Key Stage 3== ===Meaning=== right|400px|thumb|An [[element tile showing the '''mass number'''.]] The Atomic Mass or '''mass number''' is the num..."
==Key Stage 3==
===Meaning===
[[File:ElementTile.png|right|400px|thumb|An [[element]] tile showing the '''mass number'''.]]
The [[Atomic Mass]] or '''mass number''' is the number of [[nucleon]]s ([[proton]]s + [[neutron]]s) in an [[atom]].
===About The Atomic Mass===
: Two [[atom]]s of the same [[element]] may have the same [[Atomic Number]] but a different [[Atomic Mass]] depending on the number of [[neutron]]s in the [[nucleus]]. [[Element]]s with different '''mass numbers''' are called [[isotope]]s.
: The '''atomic mass''' is not affected by the number of [[electron]]s.
: Only the [[particle]]s in the [[nucleus]] affect the '''atomic mass'''.
===Examples===
{| class="wikitable"
| style="height:20px; width:200px; text-align:center;" |'''Hydrogen'''
| style="height:20px; width:200px; text-align:center;" |'''Helium'''
| style="height:20px; width:200px; text-align:center;" |'''Lithium'''
| style="height:20px; width:200px; text-align:center;" |'''Beryllium'''
|-
|[[File:Hydrogen.png|center|200px]]
|[[File:Helium.png|center|200px]]
|[[File:Lithium.png|center|200px]]
|[[File:Beryllium.png|center|200px]]
|-
|[[File:HydrogenSymbol.png|center|200px]]
|[[File:HeliumSymbol.png|center|200px]]
|[[File:LithiumSymbol.png|center|200px]]
|[[File:BerylliumSymbol.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |[[Hydrogen]] has one [[nucleon]] so it has an '''atomic mass''' of 1.
| style="height:20px; width:200px; text-align:center;" |[[Helium]] has four [[nucleon]]s so it has an '''atomic mass''' of 4.
| style="height:20px; width:200px; text-align:center;" |[[Lithium]] has seven [[nucleon]]s so it has an '''atomic mass''' of 7.
| style="height:20px; width:200px; text-align:center;" |[[Beryllium]] has eleven [[nucleon]]s so it has an '''atomic mass''' of 11.
|}
===Meaning===
[[File:ElementTile.png|right|400px|thumb|An [[element]] tile showing the '''mass number'''.]]
The [[Atomic Mass]] or '''mass number''' is the number of [[nucleon]]s ([[proton]]s + [[neutron]]s) in an [[atom]].
===About The Atomic Mass===
: Two [[atom]]s of the same [[element]] may have the same [[Atomic Number]] but a different [[Atomic Mass]] depending on the number of [[neutron]]s in the [[nucleus]]. [[Element]]s with different '''mass numbers''' are called [[isotope]]s.
: The '''atomic mass''' is not affected by the number of [[electron]]s.
: Only the [[particle]]s in the [[nucleus]] affect the '''atomic mass'''.
===Examples===
{| class="wikitable"
| style="height:20px; width:200px; text-align:center;" |'''Hydrogen'''
| style="height:20px; width:200px; text-align:center;" |'''Helium'''
| style="height:20px; width:200px; text-align:center;" |'''Lithium'''
| style="height:20px; width:200px; text-align:center;" |'''Beryllium'''
|-
|[[File:Hydrogen.png|center|200px]]
|[[File:Helium.png|center|200px]]
|[[File:Lithium.png|center|200px]]
|[[File:Beryllium.png|center|200px]]
|-
|[[File:HydrogenSymbol.png|center|200px]]
|[[File:HeliumSymbol.png|center|200px]]
|[[File:LithiumSymbol.png|center|200px]]
|[[File:BerylliumSymbol.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |[[Hydrogen]] has one [[nucleon]] so it has an '''atomic mass''' of 1.
| style="height:20px; width:200px; text-align:center;" |[[Helium]] has four [[nucleon]]s so it has an '''atomic mass''' of 4.
| style="height:20px; width:200px; text-align:center;" |[[Lithium]] has seven [[nucleon]]s so it has an '''atomic mass''' of 7.
| style="height:20px; width:200px; text-align:center;" |[[Beryllium]] has eleven [[nucleon]]s so it has an '''atomic mass''' of 11.
|}