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Which model of the atom first proposed that electrons orbit the nucleus?
The Bohr model of the atom was the first to propose that electrons orbit the nucleus in fixed paths or energy levels. This model was proposed by Niels Bohr in 1913, and it helped to explain the stability of atoms and the emission of specific frequencies of light.
How did thomsons experiment change daltons atomic model?
Thomson's experiment showed that atoms contain subatomic particles, specifically electrons. This discovery led to the modification of Dalton's atomic model, which previously considered atoms to be indivisible and uniform. Thomson's model proposed the existence of electrons within the atom.
What is the difference between the models made by Rutherford and Dalton?
Dalton's atomic model simply stated that all elements were made of tiny atoms, he said nothing about the structure of those atoms. Rutherford proposed that most of the mass of the atom is concentrated in a tiny central nucleus with positive charge.
What did democritus and Dalton and Thomson and Rutherford and bohr contribute?
Democritus proposed the concept of atoms as indivisible particles that make up all matter. Dalton developed the atomic theory, stating that elements are composed of indivisible atoms with specific properties. Thomson discovered the electron and proposed the "plum pudding" model of the atom. Rutherford conducted the gold foil experiment, leading to the discovery of the atomic nucleus. Bohr introduced the planetary model of the atom, with electrons orbiting the nucleus in specific energy levels.
Why did the modal of Rutherford could not explain the stability of atoms?
mathematically it was calculated that for the Rutherford model to be stable it would require that 1000 or more electrons be in a single atom, but atoms only have (naturally occurring atoms) less than 100 electrons.
Who proposed an atomic model in which compounds were made by combination of atoms?
the lord jesus himself and the easter bunny
How did Thomson's experiment change Dalton's atmic model?
Thomson's experiment suggested the presence of negatively charged electrons in atoms, which led to the modification of Dalton's atomic model. Dalton's model proposed that atoms were indivisible and indestructible spheres, but Thomson's discovery showed that atoms were not indivisible and contained subatomic particles, leading to the development of the plum pudding model.
How did Thompson's model differ from Daltons model?
Thompson's model proposed that atoms were made up of positive and negative charges distributed throughout a positively charged sphere, similar to a raisin pudding. In contrast, Dalton's model suggested that atoms were indivisible and uniform spheres with no internal structure. Thompson's model introduced the idea of subatomic particles, while Dalton's model viewed atoms as simple building blocks of matter.
What major changes occurred from Democritus's model to Thomson's model?
Democritus proposed the first atomic theory, suggesting that matter is made up of indivisible particles called atoms. Thomson's model, proposed in the late 19th century, introduced the idea of the atom as a sphere with embedded electrons, challenging the indivisibility of atoms seen in Democritus's model and suggesting the presence of subatomic particles. Thomson's model also laid the groundwork for the later development of the more accurate planetary model of the atom by Rutherford.
Who atomic model determined that an atoms positive charge is concentrated in the atoms center?
The Rutherford model proposed that an atom's positive charge is concentrated in a dense center called the nucleus. This model was based on the famous gold foil experiment conducted by Ernest Rutherford in 1909.
What are J. J. Thomson's ideas called?
J. J. Thomson's ideas are called the "plum pudding model" of the atom, which proposed that atoms are composed of positively charged material with negatively charged electrons embedded within it. This model was later replaced by the more accurate "nuclear model" proposed by Rutherford.
Who developed the idea of electron shell?
Niels BohrNiels Bohr proposed the first model of the atom with distinct energy levels with quantized energies. He proposed this theory based on the spectra of atoms and ions.
Who first Proposed the idea that atoms had positive and negative parts?
The idea that atoms had positive and negative parts was first proposed by J.J. Thomson in the late 19th century through his "plum pudding" model of the atom. Thomson suggested that atoms were composed of positive and negative charges distributed throughout a neutral sphere, like plums in a pudding.
Who proposed that the world is made up of atoms?
The idea that the world is made up of atoms was proposed by the ancient Greek philosopher, Democritus, around 400 BC. He suggested that all matter is composed of tiny, indivisible particles called atoms that are constantly in motion. This atomic theory laid the foundation for modern chemistry.
Who was the danish scientist that proposed electrons orbit around the nucleus?
Niels Bohr, a Danish physicist, proposed the concept of electrons orbiting around the nucleus in his atomic model known as the Bohr model. This model was a significant advancement in understanding the structure of atoms and laid the foundation for modern quantum mechanics.
What did Niels Bohrs work add to the model of the atom?
Niels Bohr's work introduced the idea of quantized energy levels in atoms, which explained the stability of certain electron orbits. He also proposed that electrons orbit the nucleus in specific, fixed paths, creating the basis for the Bohr model of the atom.
Who proposed the Experimental Learning Model?
There is no Experimental Learning Model. However, there is a learning model called the Experiential Learning Model, which was proposed by David A. Kolb as a process of learning from experience.
