* Chromium-50 (4.345% abundance)

* Chromium-52 (83.79% abundance)

* Chromium-53 (9.50% abundance)

* Chromium-54 (2.365% abundance)

In total, there are 28 known isotopes of chromium, ranging from Chromium-42 to Chromium-69. However, only the four listed above are stable and occur naturally.