The most common type of exception to the octet rule are compounds or ions with central atoms having more than eight electrons around them. PF5, SF4, ClF3 and Br3 are examples of this type of exception. Draw the Lewis structure for these compounds or ions. Which elements, when they have to, can have more than eight electrons around them? How is this rationalized?
Week of 4/11 – 4/16 Bond type is influenced by metallic character of the things bonding Metal + metal = metallic bond. Metal + nonmetal = ionic bond Nonmetal + nonmetal = covalent bond COVALENT BONDS -Happen bw elements of similar metallic character - tend to be stronger than ionic bonds -involve e- sharing -Involve orbital overlap - bonds usually don’t break in phase changes of small molecules or in solution; whereas in an ionic bond they always break in phase changes, (s) (l), and in solution if they are soluble - both nuclei of bonded atoms attract shared e- - not a static bond, it’s more of a dynamic pulsing bond bw the two atoms There are specific partners in covalent bonds and not specific in ionic bonds Covalent bond length- length bw two bonded atoms’ nucl
