Which of the following statements provides the best explanation for the many chemical similarities between two elements in a main group? (note: only one answer (a) they have similar atomic mass values. (b) both have the same number of valence electrons. (c) they have the same number of protons. (d) they are in the same period.

Easy definition for atom and atomic mass

Each pair of clay balls represents to planetesimals if each plane test molluscum pound of the same material and is separated by the same distance which pair experiences the greatest gravitational attraction

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.