Oxygen-18, fluorine-19 and neon-20 atoms have 10 neutrons each.
Fluorine (18.994-9=10 neutrons) and Neon (20.180-10=10 neutrons)
electrons
Neon, and certain isomers of other elements.
All chemical elements (excepting the isotope 1H) contain neutrons.
Lighter elements tend to have neutrons equal to protonms or only a slight excess. Heavier elements have an excess of neutrons over protons
Atoms of all elements can have neutrons in them. Only the element hydrogen has an isotope whose atoms do not contain neutrons, but all other isotopes of hydrogen have neutrons in them. In the heavier elements the number of neutrons always exceeds the number of protons in the atom.
117
neutrons of all atoms are alike
8
Protons, neutrons and electrons
Electrons, Neutrons, and Protrons
A bunch of elements can have 18 neutrons because of isotopes in the world