@prefix isq: <https://w3id.org/standards/isq/ontologies/core/> .
@prefix smart: <https://example.org/smart-sdu/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<isq:t10-21.2>
  a isq:Entry ;
  rdf:type isq:Quantity ;
  rdf:type smart:TermEntry ;
  dcterms:identifier "10-21.2" ;
  skosxl:prefLabel "mass defect"@en ;
  skosxl:altLabel "B"@en ;
  skos:definition "sum of the product of the proton number and the hydrogen atomic mass, and the neutron rest mass, minus the rest mass of the atom:\n\n[stem%unnumbered]\n++++\nB = Z m(\"\"^1\"H\") + N m_\"n\" - m_\"a\"\n++++\n\nwhere\n\nstem:[Z]:: is the proton number (<<t10-1.1>>) of the atom,\nstem:[m(\"\"^1\"H\")]:: is atomic mass (<<t10-4.1>>) of stem:[\"\"^1\"H\"],\nstem:[N]:: is neutron number (<<t10-1.2>>),\nstem:[m_\"n\"]:: is the rest mass (<<t10-2>>) of the neutron, and\nstem:[m_\"a\"]:: is the rest mass (<<t10-2>>) of the atom\n"@en ;
  smart:hasBindingnessType "bindingness-type:normative" ;
  dcterms:isPartOf <isq:part-10> ;
  isq:hasUnit [
    skos:notation "kg" ;
    skosxl:prefLabel "kilogram"@en
  ] ;
  isq:hasUnit [
    skos:notation "Da" ;
    skosxl:prefLabel "dalton"@en
  ] ;
  isq:hasUnit [
    skos:notation "u" ;
    skosxl:prefLabel "unified atomic mass unit"@en
  ] ;
  skos:note "The mass excess is usually expressed in daltons, stem:[1 \"unitsml(Da)\" = 1 \"unitsml(u)\"].\n\nIf the binding energy of the orbital electrons is neglected, stem:[Bc_0^2] is equal to the binding energy of the nucleus.\n"@en ;
  iso:urn <urn:iso:std:iso:80000:-10:ed-2:en:item:10-21.2> .