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lone pair

British  

noun

  1. chem a pair of valency electrons of opposite spin that are not shared between the atoms in a molecule and are responsible for the formation of coordinate bonds

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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The sulfur atom is surrounded by two bonds and one lone pair of electrons in either resonance structure.

From Textbooks Feb. 14, 2019

For example, NH3 reacts with BF3 because the lone pair on nitrogen can be shared with the boron atom:

From Textbooks Feb. 14, 2019

For example, an atom with four single bonds, a double bond, and a lone pair has an octahedral electron-group geometry and a square pyramidal molecular structure.

From Textbooks Feb. 14, 2019

For example, the nitrogen atom in ammonia is surrounded by three bonding pairs and a lone pair of electrons directed to the four corners of a tetrahedron.

From Textbooks Feb. 14, 2019

SF4 and have one lone pair of electrons on the central atom, and ClF3 has two lone pairs giving it the T-shape shown.

From Textbooks Feb. 14, 2019

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