Which of the following families contain elements that can be used to fill lightbulbs and cause them to glow brightly when exposed to an electric
current?
Metalloids
Alkaline earth metals
Noble gasses
Halogens

Aluminum–lithium (al-li) alloys have been developed by the aircraft industry to reduce the weight and improve the performance of its aircraft. a commercial aircraft skin material having a density of 2.47 g/cm3 is desired. compute the concentration of li (in wt%) that is required.

Compare and contrast physical changes with chemical changes.

Which process transfers heat from inside earth to its surface? convection currents in mantle pulling away of tectonic plates drawing in of tectonic plates convection currents in crust