Data Item _sample_component_atom_isotope.atom_isotope_number
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General 
- Item name
- _sample_component_atom_isotope.atom_isotope_number
- Category name
- sample_component_atom_isotope
- Attribute name
- atom_isotope_number
- Required in PDB entries
- yes
- Used in currrent PDB entries
- No
Item Description
The mass number for the chemical element (number of protons plus number
of neutrons in the nucleus).
Data Type 
- Data type code
- int
- Data type detail
- int item types are the subset of numbers that are the negative or positive integers.
- Primitive data type code
- numb
- Regular expression
- -?[0-9]+