What is the ionic charge for c, si, ge, sn and pb?

How many moles of carbon dioxide will form if 2.5 moles of c3h8 is burned

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver