The Greeks (400 B.C.E)

Democritus (460-370 B.C.E) theorized that an object can be divided until it becomes indivisible.


He believed that these indivisible particles are the basic units of matter which he labeled atoms, or in other words all substance is made of indivisible particles known as atoms.

“atomos” greek for indivisible

This is Democritus’s Exact Atomic Model:

1.All matter consists of invisible particles called atoms.
2. Atoms are indestructible.
3. Atoms are solid but invisible.
4. Atoms are homogenous.
5. Atoms differ in size, shape, mass, position, and arrangement.
->Solids are made of small, pointy atoms.
->Liquids are made of large, round atoms.
->Oils are made of very fine, small atoms that can easily slip past each other.

Isn’t it amazing that Democritus with nothing but his mind was able to form this atomic model that is so close to the truth, and is the precursor to our study and knowledge of the atom today!!!

So pretty much Democritus was a boss, but…..

Then along came Aristotle (384-322 B.C.E) who proposed conflicting theories to those of Democritus.


Aristotle believed that all substance is composed of fire, water, air, and earth contradicting the atomic theory introduced by Democritus; and, because of Aristotle’s fame and credibility his false theories were generally accepted as true for roughly the next 2,000 years.


This Model demonstrates what is known about the atom at this point in history.  Simply,  that the concept of the atom exists.

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