It’s more than one answer

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

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.