MCAT Question of the Day 307– General Chemistry Which of the following elements has a closed valence shell, but not an octet?He NeBrRnVote to see resultsVote By admin| 2016-06-06T03:52:41+00:00 June 6th, 2016|Comments Off on MCAT Question of the Day 307– General Chemistry Share This Story, Choose Your Platform! FacebookTwitterGoogle+Email