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LITHOEN

Chemical element

Chromium

A trace element strongly compatible in mantle minerals, and therefore retained in the residue when the mantle melts.

Classification

atomic number
24
symbol
Cr
block
d

How this record is known

3
Settled consensus
Cited as the accepted position of the discipline.

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.

What Lithoen records

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

Established24 protons

Chromium has atomic number 24: its nucleus contains 24 protons, and that is what makes it chromium.

  • definition basis: Atomic number is definitional: an atom with a different proton count is a different element, whatever else it shares.

Evidence support: Supported by the cited evidence one source

Evidence: Commission on Isotopic Abundances and Atomic Weights (IUPAC) 2024 Primary authority

Established51.9961 u

The standard atomic weight of chromium is 51.9961(6), a single value because its isotopic composition does not vary appreciably between normal materials.

  • definition basis: CIAAW Standard Atomic Weights 2024; the parenthesised digits are the uncertainty in the last figures as published.
  • precision note: A property of the element as found in normal materials, not the mass of any individual atom.

Evidence support: Supported by the cited evidence one source

Evidence: Commission on Isotopic Abundances and Atomic Weights (IUPAC) 2024 Primary authority

In the knowledge graph

  • Chromium preferentially partitions into Diopside

Record last updated 2026-09-06. Corrections follow the published corrections policy; superseded claims are retained, never silently edited.