III. Atomic Theory Flashcards
Atom
The smallest particle of matter
Element
Things composed of a single type of atom
Molecule
Groups of two or more atoms that are linked by
chemical bonds to form distinct units
Diatonic elements
Elements that exist as molecules composed of two atoms
Elements that exist as larger molecules
Phosphorus, Sulfur
Atomic Theory
A scientific concept that explains the nature of matter
and its behavior
Democritus
Ancient Greek philosopher that proposed Atomic Theory 01
What did Democritus call these particles?
“Atomos” - Greek for “indivisible” or “uncut”
When did Democritus propose Atomic Theory 01?
400 B.C.
Who made the Solid Sphere Model of the Atom?
John Dalton
When did John Dalton propose the Solid Sphere Model of the Atom?
1803
Who used electricity to
decompose chemical compounds?
Humphry Davy and Michael Faraday
Who proposed that units of electrical charge - negatively charged particles - were associated with atoms, and named them “electrons” (Greek “elektron”, which means “amber”)?
George Stoney
Who proposed that the atom is composed of a positively charged sphere with negatively charged electrons distributed throughout it?
J.J. Thompson
What did J.J. Thompson propose?
Plum Pudding / Raisin Bread Model
