When an atom bonds with other atoms, it forms a molecule. This occurs through the sharing, giving, or receiving of electrons between atoms. The resulting molecule will have different properties than the individual atoms that make it up.
When an atom is heated, its electrons will gain energy and jump to higher energy levels. This can result in changes to the atom's physical or chemical properties. When an atom is cooled, its electrons will lose energy and move to lower energy levels, which can also affect the atom's properties.
In a nuclear reaction, the nucleus of an atom is altered through processes such as fusion or fission. This can result in the formation of new elements or the release of large amounts of energy.
Exposure to radiation can cause changes to an atom's nucleus or its electrons. This can lead to the formation of new elements, changes in the atom's properties, or even damage to biological organisms.
In an atom's natural decay, its nucleus will emit particles or radiation, transforming into a different element. This process can occur spontaneously or be induced through external factors.