91Ó°ÊÓ

Quarks are fundamental particles that serve as the building blocks of matter. There are six unique types of quarks known as "flavours." These flavours are:

• Up
• Down
• Strange
• Charm
• Bottom
• Top

The 'flavours' essentially represent different types of quarks, each with their distinct characteristics like mass and charge. Typically, the up and down quarks are the most stable and common in the universe, making up protons and neutrons.
For example, a proton is composed of two up quarks and one down quark, while a neutron is made up of one up quark and two down quarks. The other quark flavours—strange, charm, bottom, and top—exist in higher energy states and are not usually found in regular matter. They are produced during high-energy conditions, like those in particle accelerators or cosmic events.
Quarks interact via the strong force, which is one of the four fundamental forces in physics, and this force ensures that quarks can only be found in combinations like protons and neutrons, never isolated.

The Standard Model is a theory in particle physics that describes the fundamental particles and their interactions. This model encompasses three of the four known fundamental forces of nature: the electromagnetic force, the weak nuclear force, and the strong nuclear force. Gravity, described by general relativity, is not included in the Standard Model.
The Standard Model classifies all known subatomic particles. It includes elementary particles such as quarks, leptons (like electrons), and gauge bosons, which are force carriers. Quarks and leptons are the building blocks of matter, while gauge bosons like the photon, W and Z bosons, and the gluons mediate forces between particles.
In this model, quarks are grouped into three generations, each containing two types or flavours of quarks. Along with leptons, quarks form all the visible matter in the universe. The model is a successful theory in particle physics due to its ability to predict particle interactions accurately. However, it remains incomplete as it does not explain gravity, dark matter, or dark energy.

The atomic nucleus is the central part of an atom and is composed of protons and neutrons, collectively known as nucleons. These nucleons are made of quarks, specifically up and down quarks, held together by the strong nuclear force mediated by gluons.
Each proton is composed of two up quarks and one down quark, while each neutron consists of one up quark and two down quarks. The total charge of the nucleus is determined by the number of protons, as protons are positively charged while neutrons have no charge.
The stability of an atomic nucleus is influenced by the balance between protons and neutrons. An imbalance can lead to radioactivity, causing the nucleus to undergo transformations to become stable. This process can result in the emission of particles or energy.
Nuclei are incredibly dense, containing almost all of an atom's mass. The interactions within the nucleus, dictated by the strong nuclear force, ensure that atoms maintain their integrity under normal conditions, ultimately leading to the diverse array of elements found in the universe.