MODELO ATÔMICO DE THOMSON | Resumo de Química para o Enem

In 1897, physicist Joseph John Thomson, working with cathode rays, concluded that they were an integral part of all matter and named them electrons. Learn more about Thomson's atomic model, also known as the "plum pudding" model :D Check out our free course: https://goo.gl/2rebsa Written lesson on this content: https://goo.gl/WP9bmb Simulation of this content: https://goo.gl/qtfW2V Video description: 00:00 to 00:11 - Teacher introduction and opening vignette. 00:12 to 1:18 - Thomson discovered the electron! He studied the rays emanating from a Crookes tube, a glass apparatus containing a rarefied gas and having a negative and a positive pole. By connecting the Crookes tube to an electric current, a ray called cathode ray was observed (because it came from the positive side and went to the negative). 1:19 to 3:29 - One day, observing this apparatus, Thomson decided to check what that ray actually was. Could it be that the ray had something to do with the thin air? With these doubts in mind, he observed the direction of the ray. In addition to noticing that the ray had a straight trajectory, Thomson discovered that it had mass. This led him to conclude that the ray was not energy, but matter. 3:30 to 5:12 - When the thin gas is connected to an electric current, it releases its electrons. This is how Thomson discovered the existence of the electron :) Contrary to what Dalton said—that the atom was indivisible—it was now known that the atom had a negative and a positive part. 5:13 to 6:55 - Thomson's atomic model is also called the plum pudding model: there is a mass (positive) and electrons (negative). Thomson's model of the atom is therefore massive and divisible. DID YOU LIKE THE VIDEO? // Subscribe to the channel // Give it a thumbs up // Leave your comment // Share with friends SOCIAL MEDIA // FACEBOOK /cursoenemgratuito/ // INSTAGRAM @cursoenemgratuito // TWITTER @enemgratuito Intro music: "Summer" - Royalty-Free Music from Bensound Curso Enem Gratuito is an independent channel that disseminates learning support content and information about programs and opportunities for access to higher education.