Some atoms, like the noble gases ,contain enough electrons in their valence shell orbital that they are quite satisfied and have tend not to be reactive. Of course, this does not stop chemists to exploit bonding potentials with say xenon.
Each atom wants to obtain a stable form, and tends to be in the minimum state of energy, if it gets a chance to do so. As the atoms of elements(except noble gases), have 1 to 7 electrons in their valence shell, so they are not in the minimum state of energy. Thus to attain a duplet or octet structure, the participating atoms redistribute their electrons in such a way that each atom has a stable configuration of that of the nearest noble gas. Therefore, the atoms bond with other atoms.
Noble gases have completely filled orbitals / energy levels. They generally have 8 valence electrons (helium has only 2 valence electrons) and have stable electronic configuration. Hence they are chemically inert and generally donot form compounds under normal conditions.
If you meant that literally, it's because they're too small to see. Even the largest atoms are considerably smaller than the wavelength of the highest frequency visible light.
Atoms are not found isolated in nature because most of them react with other atoms to form molecules (or ionic crystals, or metals, which are in a sense very large molecules).
the noble gases are already stable
Noble Gasses.
VIII group or the noble gases
Noble gases have completely filled electronic configuration and hence they are chemically inert (they generally do not form bonds).
Noble Gases: Because Noble Gases are already in a stable form, they are not as likely to bond with other atoms as are those farther from a stable form. Noble Gases are found in group VIII, which is the far rightmost column.
noble gases
Atoms of elements in group 18 (noble gases) do not easily combine with other elements to form compounds.
VIII group or the noble gases
Noble gases have completely filled electronic configuration and hence they are chemically inert (they generally do not form bonds).
Noble Gases: Because Noble Gases are already in a stable form, they are not as likely to bond with other atoms as are those farther from a stable form. Noble Gases are found in group VIII, which is the far rightmost column.
noble gases
Atoms or molecules do chemical reactions to be stable, noble gasses are already stable, so they do not react with other molecules to form chemical bonds
Atoms of elements in group 18 (noble gases) do not easily combine with other elements to form compounds.
Ther are no available electrons in any orbitals that are available for bonding
Noble gases are generally unreactive due to their full outer electron shells, making them stable. However, under certain conditions such as high pressure or high temperature, noble gases can react with atoms of other elements to form compounds. This occurs as these conditions can force electrons from the noble gas to form bonds with other atoms, allowing them to combine.
Their electronic configuration is similar to that of noble gases.
I would say the noble gases since as gases their atoms are isolated and they do not form diatomic molecules like all the other gaseous elements.
Noble gases have atoms with the valence electron shell filled.
All noble gases are monatomic and exist as individual atoms.