Humboldt State University ® Department of Chemistry

Richard A. Paselk

	Science 331
Fall 2004	Lecture/Activity	Office: SA560a
Notes: 8 September		Phone: x 5719 Home: 822-1116
	return to notes	e-mail: rap1

Lewis Structures for Atoms: Just show inner "kernel" where symbol stands for nucleus and all inner shell electrons:

• Sodium: Na.
• Sodium ion: Na⁺
• Phosphorus:
• Bromine:
• Bromide ion: We need the brackets to show that the bromide ion "owns" all of the electrons rather than sharing them. This is particularly important when we make an ionic compound such as sodium chloride.
• Sodium chloride:

Ionic Compound Lewis Structure Examples:

• Potassium bromide
• Aluminum chloride

Covalent Compound Lewis Structure Examples:

• Water
• Ammonia
• Ammonium ion
• Methane
• Hydrogen sulfide
• Carbon dioxide
• Carbon monoxide

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© R A Paselk

Last modified 8 September 2004