nucleus, n.All

The nucleus of an atom is so small, it's like a pea in the middle of a racetrack

The nucleus is heavy --- if it were as heavy as a bowling ball, the electrons would be as light as a penny

A nucleus is small --- if an atom were the size of a football stadium, the nucleus would be the size of a marble surrounded by vast regions of empty space

A nucleus is so dense that if it were the size of a 1x1 foot box, its weight would be the equivalent to 6.2 billion cars