Rucete ✏ Chemistry In a Nutshell
Lewis Dot diagrams
1 Mark the valence electron as a dot on the symbol of the atom.
2 The number of dots is equal to group number. (Except for helium[He])
Incomplete Octets
1 Octets rule
An atom becomes very stable when it has eight electrons.
2 Incomplete Octets
1. Atoms are stable without eight valence electrons.
2. Ex) Beryllium hydride (BeH2), Boron trifluoride (BF3)
Expanded Octets
1 In molecules that have d subshells available, the central atom can have more than eight valence electrons.
2 Central atoms are the third period like a phosphorus[P] and sulfur[S]
3 Example : PCl5, SF4, SH6
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Chemistry in a nutshell