Linked from

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

• Rutherford modelRelated: Nuclear charge in the model corresponds to the positive charge later identified with proton number.

• YttriumRelated: Yttrium’s atomic number, 39, determines its position in the periodic table.

• BariumRelated: Barium’s 56 protons distinguish it from every other element.

• Calcium ionRelated: Calcium’s atomic number remains 20 after it becomes an ion.

• Henry MoseleyNarrower topic: Moseley’s measurements established this quantity as the true basis of element order.

• XenonRelated: Xenon’s 54 protons distinguish it from every other element.

• Calcium-48Related: Its 20 protons give calcium-48 the atomic number of calcium.

• Isotopic abundanceRelated: Isotopes share this number while differing in neutron count.

• LanthanumRelated: Lanthanum's 57 protons distinguish it from every other element.

• RubidiumRelated: Rubidium’s 37 protons distinguish it from every other element.

• Systematic element nameNarrower topic: It supplies the digits that determine a systematic element name.

• ArgonRelated: Argon’s atomic number of 18 means each argon nucleus contains 18 protons.

• FleroviumNarrower topic: Flerovium’s atomic number, 114, defines its identity as an element.

• MolybdenumRelated: The value 42 distinguishes molybdenum from every other element.

• Moseley's lawRelated: It is the element-specific quantity related to X-ray frequency.

• ScandiumRelated: Scandium’s atomic number, 21, fixes its identity and place in the periodic table.

• TerbiumRelated: The value 65 distinguishes terbium from every other element.

• ActiniumRelated: Actinium’s 89 protons distinguish it from every other element.

• AmericiumRelated: Americium’s 95 protons distinguish it from every other element.

• ChalcogenRelated: Atomic number orders group 16 from oxygen to livermorium.

• Chemical element namingNarrower topic: Naming procedures use atomic numbers to identify elements and construct provisional names.

• CoperniciumNarrower topic: Copernicium's 112 protons distinguish it from every other element.

• Frederick SoddyRelated: Soddy’s isotope concept distinguished elemental identity from atomic weight.

• OsmiumRelated: Osmium is element 76 because every osmium nucleus contains 76 protons.

• TechnetiumNarrower topic: Technetium's 43 protons distinguish it from molybdenum and ruthenium.

• AstatineRelated: Astatine's 85 protons distinguish it from every other element.

• CaliforniumRelated: Californium’s 98 protons distinguish it from neighboring elements.

• DarmstadtiumNarrower topic: Darmstadtium is element 110 because every nucleus of it contains 110 protons.

• Element naming controversyRelated: Evidence for a new element must establish a previously unknown atomic number.

• Isotopes of hydrogenRelated: All hydrogen isotopes have atomic number one.

• LawrenciumRelated: Lawrencium's 103 protons distinguish it from every other element.

• Rubidium-87Related: Its 37 protons identify rubidium-87 as rubidium.

• SeaborgiumNarrower topic: Seaborgium’s 106 protons distinguish it from every other element.

• UnbiuniumNarrower topic: The number 121 specifies unbiunium’s place among the elements.

• ZirconiumNarrower topic: Forty protons define zirconium and determine its place among the elements.

• BerkeliumRelated: Berkelium's 97 protons define its position in the periodic table.

• FranciumRelated: Francium’s atomic number, 87, defines its identity.

• GadoliniumRelated: Gadolinium’s atomic number, 64, distinguishes it from every other element.

• Lead(II) ionRelated: Lead’s atomic number, 82, remains unchanged when its atoms form Pb²⁺.

• NiobiumRelated: The atomic number 41 uniquely identifies niobium.

• ProtiumRelated: Protium’s single proton gives it hydrogen’s atomic number of one.

• EuropiumRelated: Europium’s atomic number 63 distinguishes it from every other element.

• PromethiumNarrower topic: Promethium’s 61 protons distinguish it from every other element.

• RutherfordiumNarrower topic: Rutherfordium’s 104 protons define its elemental identity.

• Standard atomic weightCompared with: Unlike atomic number, standard atomic weight varies with isotope composition.

• Superheavy element researchNarrower topic: A new element is established by demonstrating a nucleus with a previously unobserved proton count.

• HafniumRelated: Hafnium’s 72 protons distinguish it from every other element.

• LutetiumRelated: Lutetium’s 71 protons distinguish it from every other element.

• RheniumRelated: Rhenium’s 75 protons distinguish it from every other element.

• CaesiumRelated: Caesium’s 55 protons distinguish it from every other element.