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With their positive charge, the protons within the nucleus are repelled by the long-range electromagnetic force, but the much stronger, but short-range, nuclear force binds the nucleons closely together. Neutrons are required for the stability of nuclei, with the exception of the single-proton hydrogen nucleus.

Why is neutron stable inside nucleus?

The neutron is an intermediary between the protons, as the discrete forces of the protons are otherwise incompatible. This bond also gives a full complement of discrete forces to the neutron, hence its stability within the nucleus.

How are neutrons stable?

Neutrons are stable inside a nucleus. This structural stability is lost when neutrons are in a free, independent state. As the neutron is a little heavier than the proton, Einstein's famous mass-energy relation equates this extra mass with an extra energy.

Why are neutrons unstable outside the nucleus?

The neutron is unstable in a nucleus when the mass of this nucleus is higher than the sum of the masses of the daughter nucleus + electron + antineutrino. It is stabilised in the opposite case. In this energy balance, the very small mass of the antineutrino is often neglected.

Why is nucleus so stable?

The mass number of an atom is the total mass number of nucleons (protons and neutrons) in the nucleus. The stability of a nucleus is determined by the forces acting within it. There is the long-range repulsive electrostatic force that acts between the protons, very strong at the very close distances in the nucleus.

Is neutron stable outside nucleus?

The neutron has no net charge and mass is slightly larger than proton. Protons and neutrons constitute the nuclei of atoms. Outside the nucleus, the neutron is unstable.

Why do nuclei need neutrons to be stable quizlet?

Why do nuclei need neutrons to be stable? It adds a net attractive force. The protons are held together by neutrons. In any radioactive decay, the sum of the mass numbers and atomic numbers must be _________ before and after the reaction.

Is neutron a stable particle?

The neutron is a baryon and is considered to be composed of two down quarks and one up quark. A free neutron will decay with a half-life of about 10.3 minutes but it is stable if combined into a nucleus.

How do you know if a nucleus is stable?

The principal factor for determining whether a nucleus is stable is the neutron to proton ratio. Elements with (Z<20) are lighter and these elements' nuclei and have a ratio of 1:1 and prefer to have the same amount of protons and neutrons.

Why a free neutron is not a stable particle?

Originally Answered: Why are free neutrons not stable? Because they can decay into protons, electrons and electron antineutrinos, they do. (Same reason Pharmas charge hundreds of times their production costs for drugs.) They can because the net mass of the decay products is less than the mass of the original neutron.