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460
Democritus
• Democritus was born in 460 BC and died in 370 BC at the age of 90.• Nationality, Greek.• He discovered and recorded the concept of atoms and called them “Atomos” meaning indivisible.• This was discovered as early as the 5th century BCE.• His theory was if you could keep cutting a block into squares that eventually you would have your smallest block and that’s how he’s theory came about. -
500
Leucippus
• Born 500BC Leucippus was basically the first to come up with a theory for the atom and what it might be. He thought that the entire universe had atoms. -
Jul 1, 1548
Giordano Bruno
• His views on the atomic theory were that there was a 3D particle that was able to move in an energetic way on its own.• As well as that the universe ad an infinite amount of suns and planets with there own intelligence.• He believed that an atom was made up of the four elements: water, earth, fire and air. -
Robert Boyle
obert had many views on the atomic theory and science.• He thought matter was made up of “clusters of particles” and that when chemical change was performed the “clusters” would rearrange themselves.• This was put towards the atomic theory and he defined an element as a substance that can’t be changed into anything else. -
Issac Newton
• . In his time he discovered that atoms stick together by a force that when they are close, the atoms force is extremely strong. -
Antoine Lavoisier
• His contribution the theory was human bodies were made up of particles but kept separate by heat and the more there was the bigger the body would expand. -
John Dalton
• He was born in 1766, Cumberland England.• His first work related to chemistry was with gases on there behaviour. • His theory proposed that all matter was made up of atoms.• That elements had different sized atoms with a different mass as well.• Compounds also had combinations of atoms. -
Joseph Proust
• He defined the law of proportions and the made out that matter could be put together like building blocks to form bigger and different matter. -
J.J.Thomson
• Born 1856. Thomson discovered the electron by accident in 1897. From here on he did many test and came up with the plum pudding model. In which negatively charged electrons were floating in a positively charged sphere. -
Ernest Rutherford
• He suggested that an atom is just empty space, where the nucleus is charged and holds most of the mass.• Also that negative charged electrons surround the nucleus. Making Thomson’s theory better. -
Frederick soddy
• Soddy offered in 1912 that elements of the same exist but in different forms. Having the same number of protons but different amount of neutrons.• Isotopes is what he called them, tells us that there can more than one of the same element but those other elements are rare. -
Hans Geiger
• He co-invented the Geiger counter, a machine that can count alpha particles.• Born 1882. -
Neils Bohr
He was born 1885. • He came out with the first drawing of the internal structure of an atom and called it ‘Bohr model’ . -
James Chadwick
• Born 1891.• He discovered the neutron, a nuclear particle slightly bigger in mass than the proton. -
Louis de Broglie
• Born 1892.• Announced that matter or more specially electron have a wave like motion to them. -
Aristotle
• He believed that instead of there being particles and masses for each and everything he thought that everything was one.
