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www.reference.com/article/neutrons-bf340beaa3c48c3d

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.

www.reference.com/science/charge-neutron-1ebbd94a5a7553e4

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.

www.reference.com/article/neutron-star-5ca87f13d8a415ac

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.

www.reference.com/science/mass-neutron-3dfe989d4cb1c284

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.

www.reference.com/article/many-neutrons-iron-49b4149dd46e73c3

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.

www.reference.com/article/discovered-neutrons-14f474c8b2924efd

Neutrons were first discovered in 1932 by James Chadwick. Chadwick conducted research with Ernest Rutherford who discovered the proton.

www.reference.com/article/number-neutrons-lead-76760d79aa962fc5

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.

www.reference.com/article/many-neutrons-nitrogen-38c7adc7294af1b1

Nitrogen has seven neutrons. It is element number seven, which means that the atom also has seven electrons and seven protons. Nitrogen has an atomic weight of 14 grams per mole.

www.reference.com/article/element-four-neutrons-9d4e19c6c09475cc

In the periodic table, lithium is the element with four neutrons. Lithium also has three protons and three electrons. Lithium is an alkali metal that is found in group one on the periodic table.

www.reference.com/article/element-16-neutrons-ccb20d38ce1599ed

Sulfur is an element with 16 neutrons. Sulfur also has 16 protons and 16 electrons. This results in an atomic number of 16 and an atomic mass of 32.