Linked from
The 174 pages that link to Atomic number, each with the reason it gives.
UnpentpentiumRelated: The hypothetical element’s defining number is 155.
UnquadoctiumRelated: The numerical roots in unquadoctium encode the element’s atomic number, 148.
UntribiumRelated: The number 123 determines both the element's identity and its systematic name.
UntrihexiumRelated: Element 136 would have 136 protons by definition.
UntritriumRelated: Its value of 113 supplied the numerical roots in ununtrium.