-
John Dalton
Was an English chemist and physicist. Best known for his pioneering work in the development of modern atomic theory and his research into colour blindness. -
Daltons Model
Discovered that certain gases only could be combined in certain proportions ever if two different compounds shered the same common element or group of elements. His findings led him to hypothesize that elements combined at the atomic level in fixed ratios. The atomic model was based on five basic theorems. -
Daltons Atomic Theory Point
- Elements are made extremely small particles called atoms.
- Atoms of a given element are identical in size, mass, and other porperties; atoms of different elements differ in size, mass, and other properties.
- Atoms can not be subdivided, created, or destroyed.
- Atoms of different elements combine in simple whole number ratios to form chemical compounds.
- In chemical reactions, atoms are combined, seperated, or rearranged
-
William Crooke
Was a British chemist and physicist. He was a pioneer of vaccum tubes, inventing the Crookes Tube. Crooke was the inventor of the Crookes radiometer. -
J.J. Thomson
Was a British physicist, FInd the first evidence for isotopes of a stable element in 1913 as part of his exploration into the composition of canal rays and with the invention of the mass spectrometer. -
Ernest Rutherford
Was a New Zealand, physicist and chemist who became known as the father of Nucleor Physics.
Gold Foil Experiment: He shot alpha particles to sheet of gold foil, a few of the particles were deflected. He concluded that a tiny dense nucleus was accusing the deflections. -
Niels Bohr
Was a Danish physicist, who made foundational contributions to understanding atomic structure. Received the Nobel Price in Physics in 1922. -
James Chadwick
Was an english physicist, Was awarded in the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932. -
J.J. Thomson Model (Plum Pudding Atomic Model)
Considered that the structure of an atom is something like a raisin bread. This model is sometimes called the Raisin Bread Model. Assumed that the basic body of an atom is a spherical object containing N electrons confired in homogeneous jelly like but relatively of massive positive charge distribution whose total charge cancels the N electrons. -
Rutherford Model
Demonstrated that the atom has a tiny, heavy nucleus in which all the mass is concentrated around which the light, called electrons, circulate at some distance much like planets revolving around the sun. Has been alternatively called the nuclear atom, or the planetary model of the atom. -
Quantum Mechanical Model
Is based on mathematics, it can be usaed to explain observations made on complex atoms. Is based too, on quatum theory, which says matter also has properties associated with waves. uses complex shapes of electron clouds. This model is based on probability rather that certainty, -
Bohr Model
Depicts the atom as small positively charged nucleus surrounded bby electrons that travel in circular orbits around the nucleus.
