Is the Atom Fundamental?
People soon realized
that they could categorize atoms into groups that shared similar chemical
properties (as in the Periodic Table of the Elements). This indicated
that atoms were made up of simpler building blocks, and that it was these
simpler building blocks in different combinations that determined which
atoms had which chemical properties.
Moreover, experiments which "looked" into an atom using particle probes indicated that atoms
had structure and were not just squishy balls. These experiments helped scientists determine
that atoms have a tiny but dense, positive nucleus and a cloud of negative electrons (e-).
Trivia: The term "atom" is a misnomer. Why?