Which idea no longer works in the quantum mechanical model of the atom? - Most of the atom is empty space
- Electrons orbit the nucleus like planets orbit the sun.
- Electrons can jump up and down energy levels.
- Atoms have a central nucleus with a positive charge.

is it a purebred? it looks more like a red nose, but it doesn't have the red could it be a staffordshire bull terrior? unsure if that's the right name for it sorry

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >