Here's why:
* Electrons are in constant motion: Electrons don't orbit the nucleus in neat circles like planets around a sun. Instead, they whiz around the nucleus in unpredictable patterns, forming a fuzzy cloud of negative charge.
* The nucleus is tiny: The nucleus, containing protons and neutrons, is incredibly small compared to the overall size of the atom. It's like a tiny marble in the center of a huge football stadium.
* Most of the atom is empty space: The electron cloud, while fuzzy, extends far beyond the nucleus, making up the vast majority of the atom's volume.
Think of it like this: Imagine a cloud, but instead of water droplets, it's made of negatively charged electrons. That cloud is what defines the size and shape of the atom, even though the electrons are constantly moving.
