<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><a href="https://bugs.freebase.com/browse/DA-582">https://bugs.freebase.com/browse/DA-582</a><br><br>With the exception of the properties listed below, I think the properties of /chemistry/chemical_element and /chemistry/isotope should be unique:<br><br>/chemistry/chemical_element/chemical_series<br>/chemistry/chemical_element/isotopes<br>/chemistry/isotope/stable<br><br>This shouldn't break any queries since the queries should have been written to handle multiple values.<br>If anyone has objections to this, let me know.<br><br>Bryan</body></html>