CHEM 1AL Chapter Notes - Chapter 2: Electron Shell, Valence Electron, Octet Rule

• School: UCSB
• Department: Chemistry and Biochemistry
• Course: CHEM 1AL
• Professor: V A N K O P P E N

Document Summary

Metallic elements are on the left side of the bold line. Nonmetals: hydrogen and elements on the right side of the bold line. High electronegativities, form negative ions in binary compounds with metals. Core electrons: the inner shells of electrons that do not participate often in bonding. Valence electrons: the outermost partially filled shells of electrons that participate in bonding. A filled valence shell is the most stable state. Lewis dot symbols: the element symbol with the valence electrons evenly distributed around it. Groups 1a through 8a: number of valence electrons in the neutral atom is equal to the elements group number. Octet rule: maximum of eight electrons in their valence shell. Ionic bond: bond between ions of opposite charge formed through the coulomb force of attraction. Tends to be between metal and non-metal ions. Covalent bond: electrons shared between 2 atoms. Tends to be between two nonmetal atoms. Do not dissociate to form ions in solution.