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www.reference.com/science/many-neutrons-hydrogen-33208cef42ccbd34

Hydrogen has no neutrons, just a single proton and a single electron. Most of the mass of an atom lies in its protons and neutrons; hydrogen has a mass of 1 because of the mass of its single proton.

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 observe...

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/many-neutrons-oxygen-743d8d7f4751785f

Oxygen has 8 neutrons, 8 electrons and 8 protons, making it a neutral element. Neutral elements have the same number of neutrons and protons. Oxygen is the eighth element in the periodic table of elements, with an atomic number of 8.

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/many-neutrons-oxygen-atom-b6d0884069f9b0f8

An atom of oxygen contains eight neutrons. A neutron is one of the particles that make up matter, which is any substance that takes up space. Neutrons are fundamental particles, meaning that they cannot be broken down.

www.reference.com/science/many-neutrons-sodium-9ef67e0d1dbf0c86

The element sodium has 12 neutrons. The element also has an atomic number of 11, meaning that it has 11 electrons and 11 protons. It has an atomic mass of 22.9, which is often rounded up to 23 to accurately determine the number of neutrons in the element.