The correct answer is C. Iron has 26 neutrons.
A neutron is a subatomic particle with no net electric charge
and a mass slightly larger than that of a proton. Neutrons and protons, together known as nucleons, make up the nucleus of an atom. The number of protons in the nucleus is the atomic number, which defines the chemical element. The number of neutrons is the neutron number, and the total number of protons and neutrons is the mass number.Iron-56 is the most stable isotope of iron, with 26 protons and 30 neutrons. It is the most abundant element in the Earth’s core and is also found in meteorites. Iron-56 is a very stable isotope because it has a magic number of both protons and neutrons. A magic number is a number of nucleons that is particularly stable. The magic numbers for protons and neutrons are 2, 8, 20, 28, 50, 82, and 126.
The other options are incorrect because they do not represent the number of neutrons in iron. Option A is incorrect because it represents the number of protons in iron. Option B is incorrect because it represents the number of electrons in iron. Option D is incorrect because it represents the number of protons and neutrons in iron-56.