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What is the significance of Thomson model?
Thomson’s experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged “soup.”
How did JJ Thomson model change?
Dalton thought that atoms were indivisible particles, and Thomson’s discovery of the electron proved the existence of subatomic particles. This ushered in a model of atomic structure referred to as the plum pudding model. The positive and negative charges cancel producing a neutral atom.
What was JJ Thomson’s contribution to physics?
A series of experiments with cathode rays he carried out near the end of the 19th century led to his discovery of the electron, a negatively charged atomic particle with very little mass. Thomson received the Nobel Prize in Physics in 1906 for his work exploring the electrical conductivity of various gases.
How important is Thomson’s atomic model in the modern society?
Modern scientists understand atoms consist of a nucleus of positively-charged protons and neutral neutrons, with negatively-charged electrons orbiting the nucleus. Yet, Thomson’s model is important because it introduced the notion that an atom consisted of charged particles.
When did JJ Thomson propose his atomic model?
Thomson atomic model, earliest theoretical description of the inner structure of atoms, proposed about 1900 by William Thomson (Lord Kelvin) and strongly supported by Sir Joseph John Thomson, who had discovered (1897) the electron, a negatively charged part of every atom.
How did JJ Thomson’s experiments demonstrate that Dalton’s model of the atom was incorrect?
He found that the mass of the particles was 2000 times smaller than the mass of the smallest atom, the hydrogen atom. In short, Thomson had discovered the existence of particles smaller than atoms. This disproved Dalton’s claim that atoms are the smallest particles of matter.