Hi.
It's Mr. Andersen and this AP Physics essentials video 3.
It is on the Atomic Nucleus which was discovered by this man, Ernest Rutherford.
JJ Thompson had already discovered the electron which they knew had a negative charge.
But they had viewed the atom as a plum pudding.
And this is what plum pudding looks like.
It is got little plums in it.
And then it has got the pudding portion.
So they thought the atom looked like this.
It was this amorphous positive charge inside the atom and then these little negative charges were interspersed.
