Protons stay together in the nucleus due to the strong nuclear force, otherwise known as binding energy. This force is the fundamental glue, so to speak, in everything. It overshadows the electromagnetic force by several orders of magnitude, so that the protons do not fly apart due to like charges repelling each other.
Protons and neutrons consist of three confined quarks each.
The measurement of how closely particles are packed together is usually by state of matter. Gasses are measured as have particles that are further apart than liquids or solids for example.
The solid phase of matter typically has the strongest attractive forces between particles. This is because the particles are closely packed together and have limited freedom of movement, allowing for strong intermolecular interactions.
Atoms are composed of subatomic particles: protons and neutrons in the nucleus, surrounded by electrons in orbitals. Protons have a positive charge, neutrons are neutral, and electrons have a negative charge. The number of protons in the nucleus determines the element's identity.
Solid state. In a solid, molecules are closely packed together in a fixed arrangement, which results in a rigid structure.
Protons and neutrons consist of three confined quarks each.
The particles are closely packed together.
Hydrogen has one proton, and one electron. However deuterium is hydrogen with one neutrons. Tritium has one proton and two neutrons.
Mountains located closely together are called a mountain range.
The condition of material closely packed together is called "dense" or "compact."
An atom is made up of 3 items: electrons which are negatively charged, protons which are positively charged, and neutrons which carry no charge. The protons and neutrons are closely grouped together in the nucleus of the atom. The electrons are in orbit around the nucleus in a similar manner as the planets orbit the sun. In this configuration it is much easier to lose or gain electrons than protons or neutrons.
A neutron star is a celestial object that consists almost entirely of neutrons, packed closely together in its core. Neutron stars are incredibly dense and form when a massive star collapses in a supernova explosion. The gravitational force of a neutron star is so strong that it can overcome the electron degeneracy pressure and collapse protons and electrons into neutrons.
Clustering
The measurement of how closely particles are packed together is usually by state of matter. Gasses are measured as have particles that are further apart than liquids or solids for example.
compacted
Clustering
Threes