Nucleon number: Difference between revisions
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== Proposed Entry == | |||
see [[Mass | The [[nucleon number]] is the number of nucleons in a molecule. | ||
It is a unitless physical property with symbol ''N''. | |||
: ''N'' = n | |||
== Comments == | |||
There used to be another name for the same property: the [[Mass number]]. | |||
This name, however, is misleading because a unitless quantity should not be called "[[Mass|mass]]". | |||
The symbol for the quantity nucleon number used to be ''m'', which is even more unfortunate because ''m'' is the official symbol of a mass quantity. | |||
The [[Nominal Mass|nominal mass]] ''M'' has a simillar meaning as the nuclear number, but it is not dimensionless. It is a mass measured in the [[Atomic Mass Unit]], also called [[Dalton]]. | |||
: ''M'' = z '''Da''' | |||
where z is an integer value. | |||
== References == | |||
see [[Mass]] | |||
Revision as of 13:49, 6 January 2005
Proposed Entry
The nucleon number is the number of nucleons in a molecule. It is a unitless physical property with symbol N.
- N = n
Comments
There used to be another name for the same property: the Mass number. This name, however, is misleading because a unitless quantity should not be called "mass". The symbol for the quantity nucleon number used to be m, which is even more unfortunate because m is the official symbol of a mass quantity.
The nominal mass M has a simillar meaning as the nuclear number, but it is not dimensionless. It is a mass measured in the Atomic Mass Unit, also called Dalton.
- M = z Da
where z is an integer value.
References
see Mass
