An isolated neutron is unstable, so an isolated antineutron is also unstable. A neutron inside a nucleus is stable, so a antineutron inside an antinucleus is also stable.
no
The value of the mass of a neutron is 1,6x10-27Kg or 0,0000000000000000000000000016Kg
No a pulsar cannot be an unstable red giant. It is nothing more than a neutron star [See related question]
An unstable nucleus which decays emitting a neutron.
the absorption of a free-moving neutron by the atom's nucleus
the atom to become unstable and rip apart
The nuclei of a stable radioactive isotope will after been bombarded with a neutron produce a radiation and enormous energy and such reaction will come to an end, while the nuclei of an unstable nuclei will continue to react with little fragment of the neutron continuously (long chain nuclear reaction) until it has attain it stable phase.mind you this reaction with the little fragment of this neutron can last over 10 years.
Hydrogen-1 (protium):1 proton, 0 neutrons (stable) Helium-2 (diproton): 2 protons, 0 neutrons (unstable - short half-life) Helium-3: 2 protons, 1 neutron (stable) Lithium-4: 3 protons, 1 neutron (unstable - extremely short half-life) Lithium-5: 3 protons, 2 neutrons (unstable - extremely short half-life) Beryllium-5: 4 protons, 1 neutron (mostly theoretical, unstable, extremely short half-life if formed) Beryllium-5: 4 protons, 2 neutron (unstable - extremely short half-life) Beryllium-5: 4 protons, 3 neutron (unstable - extremely short half-life) Boron-6: 5 protons, 1 neutron (mostly theoretical, extremely short half-life if formed) Boron-7: 5 protons, 2 neutron (unstable - extremely short half-life) Boron-8: 5 protons, 3 neutron (unstable - short half-life) Boron-9: 5 protons, 4 neutron (unstable - extremely short half-life) Carbon-8: 6 protons, 2 neutrons (unstable - extremely short half-life) Carbon-9: 6 protons, 3 neutrons (unstable - short half-life) Carbon-10: 6 protons, 4 neutrons (unstable - short half-life) Carbon-11: 6 protons, 5 neutrons (unstable - short half-life) Nitrogen-10: 7 protons, 3 neutrons (unstable - extremely short half-life) Nitrogen-11: 7 protons, 4 neutrons (unstable - extremely short half-life) Nitrogen-12: 7 protons, 5 neutrons (unstable - short half-life) Nitrogen-13: 7 protons, 6 neutrons (unstable - short half-life) Oxygen-12: 8 protons, 4 neutrons (unstable - extremely short half-life) Oxygen-13: 8 protons, 5 neutrons (unstable - extremely short half-life) Oxygen-14: 8 protons, 6 neutrons (unstable - short half-life) Oxygen-15: 8 protons, 7 neutrons (unstable - short half-life) Fluorine-14: 9 protons, 5 neutrons (unstable - extremely short half-life) Fluorine-15: 9 protons, 6 neutrons (unstable - extremely short half-life) Fluorine-16: 9 protons, 7 neutrons (unstable - extremely short half-life) Fluorine-17: 9 protons, 8 neutrons (unstable - short half-life) Neon-16: 10 protons, 6 neutrons (unstable - extremely short half-life) Neon-17: 10 protons, 7 neutrons (unstable - extremely short half-life) Neon-18: 10 protons, 8 neutrons (unstable - short half-life) Neon-19: 10 protons, 9 neutrons (unstable - short half-life) ... and the list goes on
Radio active isotopes are unstable isotopes of an element as there neutron number degenerate by emission of light or medium.
It is caused by instability of nucleus which depends upon proton-neutron ratio and cross sectional area if nucleus.
Stability of a nucleus is dictated by the neutron/proton ratio. Too large or too small and the nucleus is unstable.