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John Dalton
John Dalton discovered that all matter is composed of atoms. In 1803, John Dalton came up with the atomic theory that includes that,
1. Atoms cannot be made or destroyed
2. All atoms of the same element are identical
3.Different elements have different types of atoms
4.Chemical reactions occur when atoms are rearranged
5.Compounds are formed from atoms of the constituent elements. -
Jonh Dalton's Atomic Model
John Dalton's atomic model is not very complex because John Dalton discovered that matter was made of atoms, there had not been the discovery of protons, neutrons, or electrons. -
Wiliiam Crookes
William Crookes contributed to the atomic theory by researching on cathade rays through the use of the Crooke tubes. He concluded that these rays were emitted by a negeative electrode, travelled in a straight line, and were deflected by charged material, like magnets. His research directly influenced Thomsons' discovery of electrons. -
William Crooke's Contribution
William Crooke's did not develop a atomic model but influenced others to do so through his invention of the Crookes Tube. Crookes tubes are glass vacuum chambers that contain a positive electrode (anode) and a negative electrode (cathode). When an electrical current is passed between the electrodes of one of the tubes, it glowsdue to the interaction of electrons, which travel from the cathode to the anode and a gass inside producing the color. He discovered many properties of the Cathode rays. -
Joseph John Thomson
JJ Thomson conducted some expirements with the sole purpose of studying electrical charges in gases, and discovered the electron. -
JJ Thomson's Atomic Model
Thomson's atomic model is a continuation of Dalton's work. Since he discovered the electron, he made his atomic model accordingly. In the picture, we just se the shape of an atom with protons and electrons in it. -
Ernest Rutherford
Ernest Rutherford discovered that cells had nuclei through a set of expirements we now know as the gold foil expirement. He shot alpha particle at a gold foil with a screen behind it. If the Thomson's current model was correct, it would shoot right through. Though, not all particle went through the foil, proving that atoms are not mostly empty space. -
Rutherford's Atomic Model
This model contrasted Thomson's model. In this one, a nucleus is included. Rutherford deducted that the nucleus was a proton, so it's in the middle, and the electrons are around it. -
Niels Bohr
Bohr contributed to the development of atomic structure through the use of quantum theories. He was the first to apply Quantum theories to the atom. This vastly contributed to the field of Quantum Mechanics/Physics. -
Bohr's Atomic Model
Through Bohr's research, he concluded that the atom is a postitively charged nucles with electrons surrounding it by travellling in a ciurcular motion with electrostatic forces as means of attraction -
James Chadwick
James Chadwick conducted several experiments which led to the discovery of a particle in the nucleus with the aproximate mass of a proton and no electrical charge. This new discovery was named the "Neutron". -
Chadwick's Atomic Model
Chadwick's atomic model is essentially Bohr's atomic model. It consists of the same; a positively charged nucleus with electrons travelling around it in circular motion. Though, in his model, Chadwick also includes neutrons in the nucleus because Chadwick discovered a particle with no charge, and approximate mass of the proton in the nucleus. -
Bibliography
Ernest Rutherford. Digital image. Blogspot.com. Blogspot.com, n.d. Web. 5 Sept. 2013. James Chadwick. Digital image. Asp.org. Asp.org, n.d. Web. 5 Sept. 2013. JJ Thomson. Digital image. Chemheritage.org. Chemheritage.org, n.d. Web. 4 Sept. 2013. John Dalton. Digital image. Biography.com. Biography.com, n.d. Web. 4 Sept. 2013. Neils Bohr. Digital image. Blogspot.com. Blogspot.com, n.d. Web. 4 Sept. 2013. Rutherford's Atomic Model. Digital image. Wikimedia.org. Wikimedia.org, n.d. Web. 4 Se -
Bibliography
"The Gold Foil Expirement." Usf.edu. Usf.edu, n.d. Web. 4 Sept. 2013. "James Chadwick - Biographical." James Chadwick - Biographical. N.p., n.d. Web. 04 Sept. 2013. "John Dalton." Scienceworld.wolfram.com. Scienceworld.wolffram.com, n.d. Web. 4 Sept. 2013. "Joseph John Thomson." Homepage of the Chemical Heritage Foundation. N.p., n.d. Web. 04 Sept. 2013. "Niels Bohr - Biographical." Niels Bohr - Biographical. N.p., n.d. Web. 04 Sept. 2013.
