hypervalent

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hy·per·va·lent

 (hī′pər-vā′lənt)
adj. Chemistry
Having more valences or bonds than the normal or expected number.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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For hypervalent molecules, however, the VB portrait can become complicated and computationally cumbersome.
The theory has gained few followers so far, but Goddard says he suspects that will change as chemists show that it can resolve seeming anomalies such as hypervalent molecules and can yield useful predictions about other types of chemical behavior.