Why is #ClO_3# diamagnetic? Chemistry Electron Configuration Electron Configuration 1 Answer anor277 Mar 17, 2016 Do you mean chlorate anion: #ClO_3^-#? Explanation: The neutral #ClO_3# would be a paramagnet as it has 25 valence electrons. The anion has 26 valence electrons, with a structure based on a tetrahedron (trigonal pyramidal about #Cl#). Answer link Related questions How do electron configurations in the same group compare? How do the electron configurations of transition metals differ from those of other elements? How do electron configurations affect properties and trends of a compound? What is the electron configuration for a sodium ion? What is the electron configuration for a nitride ion? What is the electron configuration of chromium? What is the electron configuration of copper? What is Hund's Rule? What is the ground state electron configuration of the element germanium? What are some examples of electron configurations? See all questions in Electron Configuration Impact of this question 3893 views around the world You can reuse this answer Creative Commons License