 Okay, this is my attempt at drawing a depiction of an atom where to do this problem or talk about this stuff here. So it says which subatomic particles are represented by the outer, well, in our case, white sphere. Okay? So, subatomic particles, well, remember, electrons really aren't little things. They're little particles, they kind of are, but they're more kind of like a cloud or a wave. So, in this case, the subatomic particles that are represented by this sphere out here, this white sphere, are in fact the electrons that's represented by the outer sphere, which subatomic particles are represented by the solid and open spheres in the middle, so those things there. That whole cluster of things, that whole cluster of balls, solid balls, and open balls is known as the nucleus. It's the nucleus of the atom, the whole thing put together. What structure each of these subatomic particles represent, the white ones and the open ones? So it's not necessarily clear which ones are which, but one of them is going to be the neutrons and the other one is going to be, so collectively, the neutrons and protons make up this thing called the nucleus, this subatomic structure called the nucleus. And then there's these other particles or kind of wave type subatomic particles that we call electrons that form this cloud of negative charge density around the positively charged nucleus.