If multiple equally legitimate classificatory schemes exist—metallurgical, functional, isotopic—then atomic number 79 may be necessary only relative to one scheme, not absolutely necessary across all valid schemes.

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Necessary(ontological distinction in Mulla Sadra's metaphysics): The principle, God; pure existence without essence, quality or property that undergoes change or motion
absolute necessity(Contrasted with conditional necessity in debates about divine foreknowledge and contingency): Necessity that holds unconditionally, independent of any supposition; the strongest form of necessity
atomic number(as used in chemistry and the example): The number that identifies an element based on how many protons are in each atom of that element; for gold (element 79), it's always 79.
classificatory schemes(as used in logic and metaphysics): Different ways of organizing or grouping things based on different rules or characteristics—like sorting by color, size, or material.
isotopic(as used in the example): Related to different forms of the same element that have different numbers of neutrons in their atoms—a scientific way of classifying elements.
metallurgical(as used in the example): Related to metals and how they're made, refined, or used—a specific way of understanding or classifying things based on their metallic properties.
relative necessity(Wyclif's taxonomy of necessity; Logicae continuatio, tr. 1, chap. 11, p. 157): Necessity that applies to events that must follow certain conditions in order to be or happen; any contingent truth is relatively necessary if considered in relation to its conditions

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