The Atomic Thinkers

They proposed that matter is ultimately composed of small, indivisible particles called atoms.

They named them atomos.

Plato and Aristotle.

<p>They believed that matter had no smallest parts and that different substances were composed of various proportions of fire, air, earth, and water.</p> Signup and view all the answers

<p>Aristotle was influential and there was no experimental way to test the competing ideas.</p> Signup and view all the answers

<p>Certain observations in the early 1800s</p> Signup and view all the answers

<p>1905</p> Signup and view all the answers

<p>Perrin</p> Signup and view all the answers

<p>The atomic theory is the idea that all matter is composed of atoms.</p> Signup and view all the answers

<ol> <li>Each element is composed of tiny, indestructible particles called atoms. 2. All atoms of a given element have the same mass and other properties that distinguish them from the atoms of other elements. 3. Atoms combine in simple, whole-number ratios to form compounds. 4. Atoms of one element cannot change into atoms of another element.</li> </ol> Signup and view all the answers

<p>In a chemical reaction, atoms only change the way they are bound together with other atoms.</p> Signup and view all the answers

<p>John Dalton explained the laws with his atomic theory in 1808.</p> Signup and view all the answers