Rutherford, thomson and Chadwick.Write similarities between these models
Answers
The Discovery of the Parts of the Atom
Modern scientific usage denotes the atom as composed of constituent particles: the electron, the proton and the neutron.
Discuss experiments that led to discovery of the electron and the nucleus
Key Points
The British physicist J. J. Thomson performed experiments studying cathode rays and discovered that they were unique particles, later named electrons.
Rutherford proved that the hydrogen nucleus is present in other nuclei.
In 1932, James Chadwick showed that there were uncharged particles in the radiation he was using. These particles, later called neutrons, had a similar mass of the protons but did not have the same characteristics as protons.
Key Terms
scintillation: A flash of light produced in a transparent material by the passage of a particle.
alpha particle: A positively charged nucleus of a helium-4 atom (consisting of two protons and two neutrons), emitted as a consequence of radioactivity.
cathode: An electrode through which electric current flows out of a polarized electrical device.
Though originally viewed as a particle that cannot be cut into smaller particles, modern scientific usage denotes the atom as composed of various subatomic particles. The constituent particles of an atom (each discovered independently) are: the electron, the proton and the neutron. (The hydrogen-1 atom, however, has no neutrons, and a positive hydrogen ion has no electrons. )
Key Terms
electromagnetic force: a long-range fundamental force that acts between charged bodies, mediated by the exchange of photons
Avogadro’s number: the number of constituent particles (usually atoms or molecules) in one mole of a given substance. It has dimensions of reciprocal mol and its value is equal to
nucleus: the massive, positively charged central part of an atom, made up of protons and neutrons
Explanation:
The Discovery of the Parts of the Atom
Modern scientific usage denotes the atom as composed of constituent particles: the electron, the proton and the neutron.
Discuss experiments that led to discovery of the electron and the nucleus
Key Points
The British physicist J. J. Thomson performed experiments studying cathode rays and discovered that they were unique particles, later named electrons.
Rutherford proved that the hydrogen nucleus is present in other nuclei.
In 1932, James Chadwick showed that there were uncharged particles in the radiation he was using. These particles, later called neutrons, had a similar mass of the protons but did not have the same characteristics as protons.
Key Terms
scintillation: A flash of light produced in a transparent material by the passage of a particle.
alpha particle: A positively charged nucleus of a helium-4 atom (consisting of two protons and two neutrons), emitted as a consequence of radioactivity.
cathode: An electrode through which electric current flows out of a polarized electrical device.
Though originally viewed as a particle that cannot be cut into smaller particles, modern scientific usage denotes the atom as composed of various subatomic particles. The constituent particles of an atom (each discovered independently) are: the electron, the proton and the neutron. (The hydrogen-1 atom, however, has no neutrons, and a positive hydrogen ion has no electrons. )
Key Terms
electromagnetic force: a long-range fundamental force that acts between charged bodies, mediated by the exchange of photons
Avogadro’s number: the number of constituent particles (usually atoms or molecules) in one mole of a given substance. It has dimensions of reciprocal mol and its value is equal to
nucleus: the massive, positively charged central part of an atom, made up of protons and neutrons