J.J Thompson's Atomic theory

Well after the previous post that Dalton's Atomic Theory, so this time I post material high school chemistry class that the next 10 JJThompson Atomic theory of matter. for selih details, please read and understand the following explanation:

"Joseph John Thomson (1856-1940)"

Joseph John Thomson (1856-1940) is an expert in the field of physics who once aspired as a railroad engineer. But fate would, Thomson dedicate himself to science, and apart from the discovery of atomic models, he also proved the existence of electrons. From where the electrons have changed electrical and atomic theory.

Along with the development of human knowledge Dalton atomic model which states that the atom is the smallest particle that can not be divided again in the end doubtful. Until finally raised Thomshon atomic model.

According to Thomson atoms shaped like a sphere in which there are positive and negative charge spread evenly. The atomic model became known as the model of raisin bread. Neutral atoms when the number of positive and negative charges together. Negatively charged atoms when the number of negative charge more than the positive charge, and vice versa.

Thomson atomic model is obtained by the discovery of a cathode tube better by William Crookers, then JJ Thomson further research on cathode rays and it is certain that cathode rays are particles.

Experiment William Crookers

Dismantling of gas is an event flow of electrical charges in the gas discharge tube at a pressure that is very small. A discharge tube is a tube filled with air, inside the tube containing electrodes, typically called the anode and cathode. The air in the tube can not stream energized when the ends of the electrodes were connected to an inductor Ruhmkorf.

Circumstances will change if the air in the tube removed so the air pressure becomes smaller and the layout-layout air molecules even become tenuous. At a pressure of 4 cm of Hg in the tube emit red light-purple. This light will disappear increasingly smaller premises in line pressure. At 0.02 mm Hg pressure of the air in the tube is no longer emit light but upfront cathode fluorescent greenish glass. Crookes found that the rays emitted from the cathode did not seem called cathode rays. Cathode ray can be learned because it is casting glass. Cathode ray is a stream of electrons at high speed out of the cathode. Deviation of cathode rays in an electric field and a magnetic field suggests that these rays are negatively charged.

From the results of this experiment, Thomson stated that the cathode rays are subatomic particles (subatomic particles) are negatively charged and hereinafter called electrons. Atoms are neutral particles, because negatively charged electrons, then it must figs other positively charged particles to neutralize the negative charge of the electron. From these findings, Thomson rectify the shortcomings dani Dalton's atomic theory.

The Advantages of Thomson atomic theory as follows:
Proving the existence of other particles in the atomic negative bermutan. Means the atom is not the smallest part of an element.

Teeri but this is still not enough for scientists because this theory still has weaknesses. The weakness of the Atomic Theory Thompson is as follows:

Weakness Thomson atomic theory:
Weakness Thomson atomic model can not explain the arrangement of positive and negative charges in the atomic sphere.

Now that's an explanation of the atomic theory J.JThompson may be useful. Regarding the continuation of the whole theory of the atom you can find it in the next article which Ruterfod Atomic Theory and Neils Bohr atomic theory.

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