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The '''relative atomic mass''' or '''mass number''' of an [[element]] is the number of [[nucleon]]s ([[proton]]s + [[neutron]]s) in an [[atom]].
The '''relative atomic mass''' in [[gram]]s is also the [[mass]] of one [[mole]] or [[Avagadro Avogadro Constant|6.02x10<sup>23</sup>]] [[atom]]s of the [[element]].
===About Relative Atomic Mass===
: The '''relative atomic mass''' in [[gram]]s on the [[Periodic Table]] tells the [[mass]] of a [[mole]] of the [[element]]. A [[mole]] of the [[element]] is [[Avagadro Avogadro Constant|6.02x10<sup>23</sup>]] [[atom]]s of that [[element]].
: Two [[atom]]s of the same [[element]] may have the same [[Atomic Number]] but a different [[Relative Atomic Mass]] depending on the number of [[neutron]]s in the [[nucleus]]. [[Element]]s with different '''mass numbers''' are called [[isotope]]s.
: The '''relative atomic mass''' is not affected by the number of [[electron]]s.
|[[File:BoronSymbol.png|center|200px]]
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| style="height:20px; width:200px; text-align:center;" |[[Hydrogen]] has one [[nucleon]] so it has an '''atomic mass''' of 1 and [[Avagadro Avogadro Constant|6.02x10<sup>23</sup>]] (or 1 [[mole]] of) [[atom]]s of [[Hydrogen]] have a [[mass]] of 1g.| style="height:20px; width:200px; text-align:center;" |[[Deuterium]] has two [[nucleon]]s so it has an '''atomic mass''' of 2 and [[Avagadro Avogadro Constant|6.02x10<sup>23</sup>]] (or 1 [[mole]] of) [[atom]]s of [[Deuterium]] have a [[mass]] of 2g.| style="height:20px; width:200px; text-align:center;" |[[Tritium]] has three [[nucleon]]s so it has an '''atomic mass''' of 3 and [[Avagadro Avogadro Constant|6.02x10<sup>23</sup>]] (or 1 [[mole]] of) [[atom]]s of [[Tritium]] have a [[mass]] of 3g.| style="height:20px; width:200px; text-align:center;" |[[Boron]] has eleven [[nucleon]]s so it has an '''atomic mass''' of 11 and [[Avagadro Avogadro Constant|6.02x10<sup>23</sup>]] (or 1 [[mole]] of) [[atom]]s of [[Boron]] have a [[mass]] of 11g.
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