Because it was invented in 1918
Coining of the term "atom" and the idea that matter was composed of small, invisible, indivisible particles.
Ionized atom Excited atom
The term atom comes from ancient Greek meaning indivisible.
term is a word,idea is sentense
An atom smasher is an informal term for a particle accelerator.
The term "atom" was appropriate for Democritus's idea because it derives from the Greek word "atomos," meaning "indivisible." Democritus proposed that matter is composed of tiny, indivisible particles that cannot be further divided. This concept laid the groundwork for the modern understanding of atoms as fundamental building blocks of matter, reflecting his belief in the existence of these minute entities that make up all substances.
The term atomos is Greek and means, roughly, "undivisable." It simply refers to anything that cannot be further split into any part. The modern concept of the Atom was introduced by Leucippus, further expounded by Democritus, and defined again by Lucretius. Lucretius is commonly given credit for the atom as we know it today. As for the discovery of the properties of the atom, John Dalton and his assistant found the weight of an atom.
When an atom has an electric charge it is called an ion.
isotope
radioisotope
"nucleus"
"nucleus"