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500 BCE
The Alchemists
He believed that the 2 principles Mercury and Sulfur formed all metals. He also tried to purify, mature ,certain materials. -
400 BCE
Democritus
He believed that different types of tiny discrete particles formed all matter. Also, he never got married -
370
Plato
He theorized that indivisible elements shaped like triangle composed solid forms of matter. Also, he was a Greek philosopher. -
Robert Boyle
Made the idea of atomism, also thought that everything was composed of very tiny particles. He was also born on January 25th 1627 at Lismore Castle. -
Antone Lavoisier
He said that matter was conserved during chemical changes which connected to the grounding the law of conservation of mass. He also gave oxygen its name. -
John Dalton
He said that all matter is made of atoms, he also published the first atomic theory. He was known as the father of chemistry. -
Billiard Ball Model
The atom would be the ball like structure, as the concepts of atomic nucleus and electrons were unknown at the time. -
Amedeo Avogadro
He discovered the gas law, today known as Avogadro's law. He also had 6 childern. -
Dmitri Mendeleev
He came up with the the theory that states that elements are arranged from there value of their atomic weight presents a clear periodicity of properties. He was 72 when he died. -
J.J Thompson
He discovered that atoms were made up of smaller components. He discovered the "electrons " which proposed a model for the structure of the atom. He also won a nobel prize in physics. -
Pierre and Marie Curie
They were a French physicist that discovered radium and powerful radioactive elements ,polonium. Marie Curie was the first female professor at Sorbonne University. -
Plum Pudding Model
This model shows how an atom is similar to a plum pudding ,first positive in change (the pudding)with negative electrons (the plums ) scattered through it. -
Albert Einstein
He mathematically predicted the size of both molecules and atoms. Also, he did not start talking until he was 4. -
Robert Millikan
He discovered the charge of an individual electron. He also enjoyed playing tennis and golf. -
Ernest Rutherford
He described an atom as dense ,tiny, and positively charged core called the nucleus. He was also was the 4th of 12 children. -
Solar System Model
This model represents an atom , and they are like tiny solar systems -
Niels Bohr
Proposed that the hydrogen atom was based on the quantum theory that some physical quantities only take discrete values. Also, the worked on Manhattan project during World War 2. -
Henry G.J Mosely
He discovered the use of x-rays to study elements and redefine the periodic table. Also, he went to the University of Manchester. -
Electron cloud Model
This shows the area around an atom's nucleus, where electrons are most likely to be found. -
James Chadwich
He said that protons and electrons and another subatomic particle called a neutron make up an atom.