The mg-o and cr-o bond distances in mgcr2o4 are 1.98 Å and 2.02 Å respectively. the ionic radius of o2- is 1.40 Å. i) determine the ionic radii of mg2+ and cr3+

The Mg-O and Cr-O bond distances in MgCr2O4 are 1.98 Å and 2.02 Å respectively. The ionic radius of O2- is 1.40 Å. i) Determine the ionic radii of Mg2+ and Cr3+. ii) Determine the radius ratio for each of Mg2+ and Cr3+ ions. Based on the values of radius ratios, comment on the possible coordination number for each cation.