Evolution of Atom Flashcards
He believe that matter could not be divided indefinitely (400 BC)
Democritus
He proposed the hook and eye model of atom based on experimentation and not on pure reason.
John Dalton
He first proposed that atoms are divisible.
Joseph John Thomson
He named the smallest piece of matter “atomos,” meaning ________
meaning “not to be cut” or indivisible.”
He discovered neutron (1932) with the help of J.J. Thomson, his mentor.
James Chadwick
He proposed the atomic theory (1808) by studying gases.
John Dalton
He used mathematical equations to describe the likelihood of finding an electron in a certain position.This atomic model is known as the electron cloud model, also called quantum mechanical model (1926) with the help of Werner Heisenberg.
Erwin Schrodinger
He proposed an improvement by placing each electron in a specific energy level. Also proposed that electrons can move up a level if given enough energy. He called this energy a quantum of an energy and the movement of electron a quantum leap.
Niels Bohr
The father of nuclear physics and introduced that the positive electrification mentioned by Thomson is a small dense center he named nucleus (1911).
Ernest Rutherford
His theory is about atoms were small, hard particles that were all made of the same material but were different shapes and sizes.
Democritus
He proposed the atomic theory (1808) by studying gases.
John Dalton
He developed the Plum Pudding Model of Atom.
Joseph John Thompson
He also discovered the proton (1919)
Ernest Rutherford
Believed that matter could be divided into smaller and smaller pieces forever.
Believed that matter was made of a combination of four elements: earth, fire, water, air.
Aristotle
Also introduced the concept of sub-energy levels
Erwin Schrodinger
