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While the theory that neutron star mergers produce elements through neutron-capture has powerful circumstantial evidence, we are unconvinced that they produce all of the elements past nickel. Also in dispute is the exact mechanism or mechanisms that cause the white dwarfs to explode.
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neutron. The pp reaction is the rate-limiting step for...
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23 Οκτ 2024 · Ernest Rutherford, British physicist who discovered that the atom is mostly empty space surrounding a massive nucleus and who did many pioneering experiments with radioactivity. He was also known for predicting the existence of the neutron and calculating Avogadro’s number.
11 Απρ 2022 · Explain the research method that led to the discovery of neutron stars, located hundreds or thousands of light-years away; Describe the features of a neutron star that allow it to be detected as a pulsar; List the observational evidence that links pulsars and neutron stars to supernovae
The atomic model consists of a nucleus containing protons and neutrons, surrounded by electrons in shells. The numbers of particles in an atom can be calculated from its atomic number and...
The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden gold foil experiment.
Rutherford himself had discovered alpha particles, after building on work by radioactivity pioneers Marie and Pierre Curie, and Henri Becquerel. Today we know that alpha particles are two protons and two neutrons bound together like a helium-4 nucleus.
In the late 1800s, scientists discovered that atoms are composed of three subatomic particles, called protons, neutrons, and electrons. The protons and neutrons are located in a central region of the atom called the nucleus, and the electrons occupy the space surrounding the nucleus.
