a) Ammonium cation (NH4*) b) Hydroxide (HO) c) Formaldehyde (CH₂O) d) Ethylene (CH₂CH₂) e) Acetic acid (CH3COOH)

2. Which of the following elements can form hyper coordinate compounds? Be, N, Br, F, none of the above can form compounds-with an expanded octet

Create a concept map with "the octet rule" at the center using as many of terms listed below as possible. Use your concept map as an outline to write a paragraph summary.   Remember that a concept map should demonstrate your understanding of RELATIONSHIPS between terms by using connecting lines and branches.  You are encouraged to add as much personalization as you can or need to; use different colors and connecting words and phrases.     Example attached.

[Review Topics] [References] Unshared, or lone, electron pairs play an important role in determining the chemical and physical properties of organic compounds. Thus, it is important to know which atoms carry unshared pairs. Use the structural formulas below to determine the number of unshared pairs at each designated atom. Be sure your answers are consistent with the formal charges on the formulas. H3C -C=N=O a H₂C-C=N a b C Submit Answer C The number of unshared pairs at atom a is The number of unshared pairs at atom b is The number of unshared pairs at atom c is The number of unshared pairs at atom a is The number of unshared pairs at atom b is The number of unshared pairs at atom c is Retry Entire Group 1 more group attempt remaining V

Defintions of ionic compounds and covalent compounds and examples

Answer the following question.