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What model showed the electrons in fixed orbitals around the nucleus?
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∙ 8y ago
The model that showed electrons in fixed orbitals around the nucleus is called the Bohr model of the atom. Proposed by Danish physicist Niels Bohr in 1913, the Bohr model was a significant advancement in understanding the structure of atoms.
Key features of the Bohr model include:
1. Quantized Energy Levels: Bohr proposed that electrons orbit the nucleus in fixed, circular orbits at specific distances from the nucleus. These orbits, or energy levels, are quantized, meaning that electrons can only occupy certain discrete energy levels and cannot exist between them.
2. Angular Momentum Quantization: Bohr postulated that electrons in these orbits possess quantized angular momentum, which is related to the radius of the orbit and the electron's velocity.
3. Stability of Orbits: According to the Bohr model, electrons can only occupy orbits where their angular momentum is an integer multiple of Planck's constant divided by 2π. This restriction on angular momentum results in stable orbits, with electrons in lower energy levels closer to the nucleus and higher energy levels further away.
4. Emission and Absorption of Radiation: Bohr's model explained the spectral lines observed in the emission and absorption spectra of elements. When electrons transition between energy levels, they emit or absorb energy in the form of electromagnetic radiation, producing characteristic spectral lines.
Despite its success in explaining certain properties of atoms, the Bohr model had limitations. For instance, it could not fully account for the behavior of multi-electron atoms or explain the fine details of atomic spectra observed experimentally. The development of quantum mechanics in the 1920s provided a more comprehensive framework for understanding the behavior of electrons in atoms, superseding the Bohr model. However, the Bohr model remains an important milestone in the history of atomic theory and continues to be taught as a foundational concept in chemistry and physics education.
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Which scientist developed a model of the atom that looked like a nucleus surrounded by electrons?
The scientist that developed the iconic atom model that depicts a nucleus surrounded by electrons was Ernest Rutherford. Rutherford developed the model in 1911 after displaying some experiments that showed that the J.J.Thomson model was incorrect. Rutherford's experiment showed that an atom is a small but heavy central particle and is surrounded by a cloud of electrons. This was the opposite of what Thomson's model proposed.
Which showed electrons in specific fixed orbits?
The Bohr model
What did Rutherford discover about atom structure?
Rutherford oversaw the gold foil experiment. This experiment showed that the atom is mostly empty space and that most of its mass is concentrated in a tiny central core called the atomic nucleus.
What is Rutherford's experiment with gold foil and alpha particles?
The initial discovery of "Rutherford Scattering" was made by Hans Geiger and Ernest Marsden in 1909 when they performed the gold foil experiment under the direction of Rutherford, in which they fired a beam of alpha particles (helium nuclei) at layers of gold leaf only a few atoms thick. The intriguing results showed that around 1 in 8000 alpha particles were deflected by very large angles (over 90°), while the rest passed straight through with little or no deflection. From this, Rutherford concluded that the majority of the mass was concentrated in a minute, positively charged region (the nucleus) surrounded by electrons. When a (positive) alpha particle approached sufficiently close to the nucleus, it was repelled strongly enough to rebound at high angles. The small size of the nucleus explained the small number of alpha particles that were repelled in this way.
Why do you say that electrons have wave properties?
It was not just DeBroglie that reached that conclusion, others contributed to that theory, like Einstein, Bohr, Heisenberg and Schrödinger. What DeBroglie did was to establish that matter in general has that duality, but it can only be observed in microscopic particles, like electrons, because they are so small and travelling so fast that the wave nature is apparent. His formula can be used for any object, but only at the microscopic level is where we can observe the wave properties of a particle.
Who showed that electrons revolve around the nucleus in set orbits?
you showed it
How did bohr and schrodinger describe the atom?
1-Electrons are assumed to revolve around the atomic nucleus in discrete orbitals,and the position of any particular electron is more or less well defined in terms of its orbitals 2-energies of electrons are quantized;that is, electrons are permitted to have only specific values of energies.
What is the Niels Bohr model?
The model that simply showed atoms as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus-similar in structure to the solar system, but with electrostatic forces providing attraction, rather than gravity.
Which scientist developed a model of the atom that looked like a nucleus surrounded by electrons?
The scientist that developed the iconic atom model that depicts a nucleus surrounded by electrons was Ernest Rutherford. Rutherford developed the model in 1911 after displaying some experiments that showed that the J.J.Thomson model was incorrect. Rutherford's experiment showed that an atom is a small but heavy central particle and is surrounded by a cloud of electrons. This was the opposite of what Thomson's model proposed.
Why Rutherford's model of the atom is called the nuclear atom?
The Rutherford model was called the nuclear model because he decided on the atom to consist of both the nucleus, and the orbits of electrons, so he separated the nucleus from being combined with the whole atom. it is a due to his test of gold foil being shot with a cathode ray, and since most of the electrons went right through the gold foil, he assumed that the atom was filled with mostly empty space, and that is why the modern description of an atom has a huge size for where the electrons ought to be, with such a small nucleus.
What does the term- an atom is mainly made up of empty space mean?
It means that the electrons occupy a 'cloud' around the nucleus that is thousands of times larger than the nucleus, and between the electron cloud and the nucleus, there's nothing but empty space. When I was a kid in school, like 60 years ago, I saw a picture in a kids' science book that explained this, and the way that scale drawing represented it has always stuck with me. It showed the nucleus, compared to the size of the whole atom, as a bunch of grapes in the state of Texas.
What did Niels Bohr's model of an atom look like?
cleveland calvilers
What is most accurate about regarding atoms?
The currently accepted atomic model is the Electron Cloud model. It is more accurate than the Bohr model because what Niels Bohr did not know was that electrons weren't always in perfect alignment in perfect orbit around the atomic nucleus. The Electron Cloud model shows that electrons do not have to be perfectly aligned around the nucleus in specific energy level 'rings' as the Bohr model showed.
Why was J J Thomson's model incorrect?
The model was incorrect for many reasons. The primary reason is because there is no cloud of positive charge. There are protons instead with a nucleus And also neutrons cod 6 is the best and godlike
Which showed electrons in specific fixed orbits?
The Bohr model
What is the Thomson model of the atom?
J.J. Thompson's model of the atom is also known as the "plum pudding" model. Thompson modeled the atom as a mixture of positive protons amongst negatively charged electrons.Ernest Rutherford proved this model to be incorrect when he showed that the positive protons of an atom are located in the central nucleus. If the nucleus of a hydrogen atom were expanded to the size of a tennis ball, the electrons surrounding the nucleus would be (on average) several kilometers away from the nucleus.
Rutherfords alpha scattering experiments showed that the charge on the nucleus of the atom must be?
The atomic nucleus is positive because contain protons.
