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www.reference.com/science/protons-neutrons-called-323cad9b6059c758

Collectively, protons and neutrons are called nucleons. Along with electrons, they make up the three subatomic particles in an atom.

www.reference.com/science/element-20-protons-20-neutrons-b8ad5f445064d314

Calcium has 20 protons and 20 neutrons. This element is number 20 on the Periodic Table of the Elements and has an atomic weight of 40.078.

www.reference.com/science/many-neutrons-carbon-cb9bd09d2084f48c

Most carbon atoms have six neutrons. Although carbon is defined as having six protons, the number of neutrons in a carbon nucleus can vary, which gives rise to the various isotopes of carbon. Fifteen isotopes of carbon, ranging from two to 16 neutrons, have been observed by scientists.

www.reference.com/article/charges-protons-neutrons-electrons-77a5919012729443

Atoms have positive protons, no charge neutrons and negative electrons. The positive and the negative describes the charge of the atom.

www.reference.com/science/many-protons-neutrons-aluminum-e6d60112a18483c8

One atom of aluminum has 13 protons and 14 neutrons. Protons are the positively charged particles in an atom, while neutrons are subatomic particles that have no charge.

www.reference.com/article/number-protons-carbon-fd9d3c9c8d023809

The element carbon contains six protons in its atomic structure. Carbon has six neutrons that exist with the protons, found in the nucleus of each atom of carbon.

www.reference.com/article/sum-protons-neutrons-de9a56d4529a4c95

The sum of protons and neutrons is the mass number. The mass of an atom is contained mainly within the nucleus where the protons and neutrons live. An electron's mass does not contribute significantly to the mass of the atom.

www.reference.com/article/many-protons-carbon-9de7de21a5c84880

Carbon has six protons, which determines its place in the periodic table. All chemical elements possess an atomic number like this, starting with hydrogen at the atomic number of one. Carbon is the element widely accepted as being the key component for life on Earth.

www.reference.com/article/masses-protons-neutrons-compare-b54abdf8a1b9f152

A neutron has a slightly greater mass than a proton. According to Dick Plano, professor emeritus of physics at Rutgers University, there are many hypotheses for the mass difference, but a universally accepted hypothesis does not exist.

www.reference.com/science/discovered-protons-electrons-neutrons-9874fd87055357be

The discoveries of electrons, protons and neutrons were made by J. J. Thomson, Ernest Rutherford and James Chadwick respectively. They were staggered over a period of 35 years.