When one atom of sodium (na) combines with one atom of fluorine (f), they form the compound sodium fluoride (naf). which of the following best describes the arrangement of valence electrons in a bond between na and f? 1. the valence electrons are shared equally between na and f. 2. the valence electrons spend more time around the atom of na. 3. the valence electrons spend more time around the atom of f. 4. the valence electrons are given up by the na and gained by the f.

The small bags of silica gel you often see in a new shoe box are placed there to control humidity. despite its name, silica gel is a solid. it is a chemically inert, highly porous, amorphous form of sio2. because water vapor readily adsorbs onto the surface of silica gel, it acts as a desiccant. despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided you should be able to make an educated guess about the thermodynamic characteristics of the process. predict the signs for δg, δh, and δs for the adsorption of water.