Na2SeO2 crystallizes in the orthorhombic Fddd space group. Na(1) is bonded in a 5-coordinate geometry to three equivalent Se(1) and two equivalent O(1) atoms. Se(1) is bonded in a 8-coordinate geometry to six equivalent Na(1) and two equivalent O(1) atoms. O(1) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Se(1), and one O(1) atom.
Na2SeO2 crystallizes in the orthorhombic Fddd space group. Na(1) is bonded in a 5-coordinate geometry to three equivalent Se(1) and two equivalent O(1) atoms. There are a spread of Na(1)-Se(1) bond distances ranging from 2.89-2.94 Å. There is one shorter (2.32 Å) and one longer (2.35 Å) Na(1)-O(1) bond length. Se(1) is bonded in a 8-coordinate geometry to six equivalent Na(1) and two equivalent O(1) atoms. Both Se(1)-O(1) bond lengths are 2.23 Å. O(1) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Se(1), and one O(1) atom. The O(1)-O(1) bond length is 1.47 Å.