Linked from

The 174 pages that link to Atomic number, each with the reason it gives.

• DubniumRelated: Dubnium's 105 protons define its identity as element 105.

• EinsteiniumRelated: Ninety-nine protons distinguish einsteinium from every other element.

• FermiumNarrower topic: Fermium has 100 protons, the defining feature that places it at element 100.

• Group 10 elementRelated: Atomic number fixes the sequence from nickel through darmstadtium in the group.

• Isotopes of oxygenRelated: Every oxygen isotope has atomic number eight.

• Synthetic elementNarrower topic: Producing a new element requires creating a nucleus with a previously distinct proton count.

• UnbihexiumNarrower topic: Unbihexium’s proposed identity is defined by having 126 protons.

• UnquadpentiumRelated: The number 145 determines both the hypothetical element's identity and its systematic name.

• Group 11 elementRelated: Atomic number sets the sequence that places copper, silver, gold, and roentgenium in the column.

• History of atomic theoryRelated: It replaced atomic mass as the fundamental identifier of an element.

• LivermoriumNarrower topic: Livermorium's identity as element 116 is fixed by its 116 protons.

• MeitneriumRelated: The value 109 distinguishes meitnerium from every other element.

• MendeleviumRelated: Mendelevium’s 101 protons distinguish it from neighboring elements.

• Period 3 elementRelated: Period 3 runs consecutively from atomic number 11 to 18.

• PraseodymiumNarrower topic: Praseodymium’s atomic number, 59, fixes its identity and place in the periodic table.

• RoentgeniumNarrower topic: Roentgenium’s 111 protons distinguish it from every other element.

• ThalliumRelated: Thallium’s 81 protons distinguish it from every other element.

• UnbiquadiumNarrower topic: The number 124 in Unbiquadium’s designation is its defining nuclear property.

• UnpenthexiumNarrower topic: The number 156 specifies unpenthexium's defining nuclear charge.

• Helium atomRelated: Helium’s atomic number is two, fixing its identity across all isotopes.

• History of the periodic tableRelated: Ordering elements by proton count resolved conflicts in weight-based arrangements.

• NobeliumNarrower topic: Nobelium’s 102 protons distinguish it from every other element.

• Period 2 elementRelated: Increasing atomic number from 3 to 10 orders the elements across this period.

• Period 7 elementRelated: Atomic number orders period 7 from francium through oganesson.

• ProtactiniumRelated: Protactinium's 91 protons distinguish it from every other element.

• UnbipentiumNarrower topic: The number 125 specifies how many protons an Unbipentium nucleus would contain.

• UnbitriumNarrower topic: The number 123 in unbitrium’s designation is its defining identifier.

• UnhexoctiumNarrower topic: 168 specifies the proton count that defines the hypothetical element.

• UnhexpentiumNarrower topic: Unhexpentium's proposed identity is fixed by its 165 protons.

• UnpentquadiumRelated: The value 154 specifies the proton count that defines this hypothetical element.

• UnpentuniumNarrower topic: The number 155 identifies the element that the systematic name denotes.

• UnquadquadiumNarrower topic: The number 144 in unquadquadium’s designation is its defining atomic number.

• UntrienniumNarrower topic: The value 139 fixes which element the systematic name designates.

• UntriniliumNarrower topic: Untrinilium’s proposed identity rests on having 130 protons.

• Whole-number ruleRelated: It fixes one part of the nucleus's integer particle count.

• Atomic propertiesRelated: Proton count determines elemental identity and shapes the atom’s electron arrangement.

• BohriumRelated: The value 107 distinguishes bohrium from every other element.

• Charles BarklaRelated: Characteristic X-ray frequencies vary systematically with the element’s atomic number.

• Decay productRelated: Changes in proton number determine whether a product is a new element.

• Group 3 elementRelated: Atomic number fixes the sequence in which Group 3 candidates appear.

• Isotopes of nitrogenRelated: Nitrogen's atomic number remains seven across all its isotopes.

• Isotopes of uraniumRelated: Every uranium isotope has atomic number 92, regardless of its neutron count.

• Period 1 elementRelated: The two elements in Period 1 have atomic numbers 1 and 2.

• Primordial nuclideRelated: It distinguishes elements while neutron number distinguishes their nuclides.

• UnbibiumNarrower topic: The number 122 specifies the proton count that unbibium would have.

• UnbienniumRelated: The number 129 fixes which hypothetical element Unbiennium names.

• UnbioctiumNarrower topic: The number 128 in Unbioctium’s designation specifies its proton count.

• UnbiseptiumNarrower topic: The value 127 identifies the hypothetical element called unbiseptium.

• UnhexenniumRelated: The number 169 determines both the hypothetical element’s identity and its temporary name.

• UnhexquadiumNarrower topic: The value 164 determines which hypothetical element unhexquadium names.