Electrons are located in a diffuse region around the nucleus called the electron cloud, arranged in energy levels (shells) rather than sitting inside the nucleus itself.

Basic picture

  • An atom has a tiny central nucleus made of protons and neutrons, and electrons occupy the space around it rather than the center.
  • This surrounding region is called the electron cloud, which takes up almost all the atom’s volume while the nucleus is extremely small in comparison.

Electron cloud, not fixed orbits

  • Electrons are not like little planets on perfect circular tracks; instead, their exact positions are uncertain and described by probability.
  • The cloud shows where an electron is most likely to be found at any moment, based on quantum mechanics rather than fixed paths.

Energy levels (shells)

  • Electrons occupy specific energy levels or shells around the nucleus, with the first level closest in, then second, third, and so on, each farther away.
  • Only certain energy levels are allowed, so electrons “live” in these discrete shells instead of at any random distance.

Orbitals inside shells

  • Each shell is made of subshells and orbitals, which are three‑dimensional regions where electrons are most likely to be found.
  • Each orbital can hold up to two electrons, and the way electrons fill these orbitals explains many chemical properties of elements.

Valence electrons

  • The outermost electrons in the highest occupied shell are called valence electrons, and they are the ones that take part in chemical bonding.
  • Elements’ positions in the periodic table reflect how many valence electrons they have and how those electrons are arranged around the nucleus.

In short, electrons are found in a probabilistic cloud of energy levels, shells, and orbitals surrounding the nucleus—not inside it—shaping how atoms bond and behave.

Information gathered from public forums or data available on the internet and portrayed here.