Neutrons are always found within the atom's nucleus. They are one of the three main building blocks on an atom, along with protons and electrons. Each type of element has a specific number of each of these building blocks, which can easily be determined by consulting the periodic table of elements.
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Neutrons are the particles in an atom that have a neutral charge. Protons and electrons are other particles found in an atom. Protons have a positive charge and neutrons have a negative one.
A neutron star is a star whose core is made up mostly of neutrons. They are what's left of stars that were four to eight times more massive than the sun. These stars originate from catastrophic explosions called supernovae.
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Lead has 125 neutrons. It also has 82 electrons and 82 protons, and its atomic symbol is Pb. Lead is a metal that has been known since ancient times.
A single neutron has a mass of 1.008665 atomic mass units. An atomic mass unit is a very small unit of mass equal to one-twelfth of the mass of a carbon-12 atom. Neutrons have a slightly larger mass than protons, which have a mass of 1.007277 atomic mass units.
Neutrons were first discovered in 1932 by James Chadwick. Chadwick conducted research with Ernest Rutherford who discovered the proton.
The number of neutrons in an atom of iron is variable, with the most common number being 30. While the number of protons is diagnostic of an atom and does not change without changing the element itself, the number of neutrons varies by isotope.