Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 8 - Basic Concepts of Chemical Bonding - Exercises - Page 335: 8.33c


There are 8 electrons surrounding the $Si$ atom.

Work Step by Step

In the formation of $SiCl_4$ molecule, with each $Cl$ atom sharing 1 electron, the $Si$ atom also shares 1 electron. Therefore, with 4 $Cl$ atoms for 1 $Si$ atom, the $Si$ atom would share all 4 of its valence electrons and get back 8 valence electrons that can be used by all the atoms. Therefore, surrounding the $Si$ atom is 4 sharing spots, with each spot having 2 electrons. That means surrounding the $Si$ atom is 8 valence electrons, which is an octet. In the diagram, we saw that in the $SiCl_4$ molecule, there are 4 lines and no dots surrounding the $Si$ atom. Each line represents a shared electron pair, which means there are 8 electrons surrounding the $Si$ atom.
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