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Isaac Newtown,1704,Lincolnshire, England
Isaac Newton was born in 1642. Discoveries and ideas
he proposed that the universe is mechanical with small solid massses in motion. Contribution:
He gave us understanding that atoms are held together by attractions.
He aslo prposed that atoms are held together by attractions in simple terms they are held together by forces. source:
http://scienceworld.wolfram.com/biography/Newton.html -
John Dalton, 1803, Cumberland, England
John dlaton was born in 1766 in England Discoveries and ideas
1. All matter is composed of tiny particles called atoms.
2. Atoms can’t be broken into smaller particles.
3. Atoms of the same element are alike.
4. Atoms join together in fixed ratios. Contribution:
all matter is composed of tiny particles called atoms. source:
http://www.biography.com/people/john-dalton-9265201?page=2 -
George Johnstone Stoney, 1894, Oak Park, Ireland
George johnstone stoney was born in 1826 in ireland Discoveries and ideas
He discovered the electron
Understanding of negative charge Contributions
He discovered the electron and gave us a better understanding of negative charge. Source:
http://famousirishscientists.weebly.com/george-johnstone-stoney.html -
Joseph John Thomson, 1897, Manchester, England
Joseph john Thomson was born in 1856. Discoveries and ideas
He gave us "plum pudding theory"
Discovered elctrons and isotopes Contribution:
he gave us the theory an atom is made up of positively charged particles with tiny electrons are scattered around atom like raisins in a plum pudding. source:
http://scienceworld.wolfram.com/biography/Thomson.html -
Mark Planck, 1900, Germany
Mark Planck was born in 1858 in Gerany Discoveriess and ideas
Used the idea of quanta (discrete units of energy) to explain hot glowing matter.Created Planck’s constantCreated Planck’s Law of Black-body Radiation
Contribution: He gave us a better understanding of the subatomic process source:
http://scienceworld.wolfram.com/biography/Planck.html -
Hanatora Nagaota, 1903, Omura, Japan
Hanatora Nagaota was born in 1865 in Japan Discoveries and Ideas
Planetary model of atoms’- electrons revolving around the nucleus, bound by electrostatic forces. Contribution:
• He created a slightly incorrect of an atom based on solar system and helped with understanding of structure of an atom -
Robert Andrews Milikan, 1909, America
Robert Andrews Milikan was born in 1868. Discoveries and ideas‘
Milliken oil drop experiment’- Successfully measured the charge of a single atom (1.60 x 10-19 coulombs) Contribution:
He Allowed us to measure the charge to mass ratio of an electron. source:
http://www.biography.com/people/robert-a-millikan-9408867 -
Ernest Rutherford, 1911, Britian & New Zealand
Ernest Rutherford, was born in 1871 in New Zealand Discoveries and ideas
Atoms containe a dense nucleus containing all its positive charge. Contribution:
Electrons orbit a positively charged nucleus like planets move around the sun. source:
http://www.biography.com/people/ernest-rutherford-39099 -
Henry Gwyn-Jeffreys Moseley, 1914, England
Henry Gwyn-Jeffreys Moseley was born in 1868 in United states Discoveries and ideas
Each nucleus was characterised by an atomic number, equal to the number of unit positive charges associated with it. Contribution:
Each nucleus was characterised by an atomic number, equal to the number of unit positive charges associated with it. source:
http://www.britannica.com/EBchecked/topic/393528/Henry-Gwyn-Jeffreys-Moseley -
Niels Bohr, 1922, Denmark
Niels Bohr was born in 1885 in denmark. Dicoveries and ideas
Shell model’- Electrons could circle a nucleus without radiating energy only in orbits.
The liquid drop model of the atomic nucleus Contributions:
• He gave us a further understanding of how the atomic structure and properties. source:
http://www.britannica.com/EBchecked/topic/71670/Niels-Bohr -
James Chadwick, 1932, England
James Chadwick was born in 1891 in England Discoveries and ideas
Discovered neutrons. Contribution:
discovered negative charge in the atoms source:
http://www.nobelprize.org/nobel_prizes/physics/laureates/1935/chadwick-bio.html -
Democritus, 380 BC, Abdera, Greece
He lived in 460 bc in Greece Discoveries and ideas
He claimed that everything is made up of atoms. He also theorised that atoms are indestructable. Contribution:
He gave us the idea that atoms exist. Source
http://www.universetoday.com/60058/democritus-atom/
