Which element has the highest thermal conductivity

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

Which are forms of frozen water? check all that apply. dew frost hail rain sleet

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.