Chromium has atomic number of 24. Its valence shell electronic configuration will come out to be 4s1 3d5. The electrons in the 3d54s1 shells form the valence electrons as the five electrons in the 3d shell participate in chemical bond formation. Chromium has multiple valences, and this is due to the fact that it has three oxidation states of +6, +3 and +2. Chromium lies in Group 6 of the Periodic Table ; i.e. there are 6 valence electrons.