Common positive oxidation states for an element with atomic number 24 , are +2 to +6 Chromium ( Z=24 ) Electronic configuration: [Ar] 4s13d5 It has five electrons in 3d-subshell and one electron in 4s-subshell. Thus, chromium metal has six valence electrons. Chromium can lose some or all of its valence electrons to form ions with different oxidation states. Thus, chromium shows the oxidation states of +1, +2,+3,+4,+5 and +6 respectively. The most common oxidation states of chromium are +2,+3 and +6.