5. Know that all atoms ultimate goal is to have 8 electrons in their outermost orbital , and they have the ability to lose or gain electrons why does it make sense that elements from group one are often bonded with elements from group 17
6. Using the same idea from number 5 why does group 18 unreactive

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.