Chemical element

Molybdenum

A trace element recovered principally from porphyry copper systems, where it is the second metal of the copper-molybdenum class.

How this record is known

3 of 3 claims on this page cite at least one registered source. Counts describe how each statement is known, not how likely it is to be true.

Each claim states how it is known and cites its evidence.

Established42 protons

Molybdenum has atomic number 42: its nucleus contains 42 protons, and that is what makes it molybdenum.

Evidence support: Supported by the cited evidence one source

Established95.95 u

The standard atomic weight of molybdenum is given as 95.95(1).

precision note: The parenthesised figure is the uncertainty in the last digit as CIAAW states it; Lithoen carries the value and records the uncertainty here rather than inventing an interval.

Evidence support: Supported by the cited evidence one source

EstablishedMo

The symbol for molybdenum is Mo, as given in the CIAAW table of standard atomic weights.

Evidence support: Supported by the cited evidence one source

Record last updated 2026-09-07. Corrections follow the published corrections policy; superseded claims are retained, never silently edited.