How did the discovery of the electron change the atomic model? A.it disaproved the earlier idea of an indivisible atom. B.it confirm that atom are very tiny. C. It exposed fraudulent experiments conducted by unqualified scientists. D. It proved that atom are easier to see than once believed
B, C and D are pure made up ridiculous answers.
soo its A?
The discovery of the electron significantly changed the atomic model by disproving the earlier idea of an indivisible atom. This discovery was made by J.J. Thomson in 1897 through his experiments with cathode rays. To understand how this changed the atomic model, we need to know how Thomson conducted his experiment and what he observed.
To get the answer, we should start by understanding Thomson's experiments. He used a cathode ray tube, which is a sealed glass tube in which a cathode (a negatively charged electrode) and an anode (a positively charged electrode) are placed at opposite ends. When a high voltage is applied across the electrodes, a stream of particles, the cathode rays, is emitted from the cathode and travels towards the anode.
Now, to observe the behavior of these cathode rays, Thomson introduced a negatively charged plate into the path of the rays. He discovered that the rays were deflected towards the positively charged plate. This indicated the presence of negatively charged particles in the cathode rays.
Thomson concluded that these negatively charged particles were fundamental subatomic particles and named them "electrons." He proposed a new atomic model, called the "plum pudding model," which depicted atoms as a positive "pudding" with embedded electrons like plums. According to this model, an atom is not indivisible but consists of both positively charged particles (the pudding) and negatively charged electrons (the plums).
Therefore, the discovery of the electron not only disproved the idea of an indivisible atom but also introduced the concept of subatomic particles and led to the development of a new atomic model that incorporated these particles. So, the correct answer is A. It disproved the earlier idea of an indivisible atom.