The arrangement of electrons in an atom is called the

• A. Electron configuration
• B. Chemical bonding
• C. Noble-gas configuration
• D. Noble gases

Answer: (A)

The main idea here is how electrons are arranged around the nucleus. This arrangement is called the electron configuration. It describes which energy levels and sublevels (like 1s, 2s, 2p, 3d, etc.) are occupied and by how many electrons, typically written in a compact notation such as 1s2 2s2 2p6 for neon. This configuration results from principles that govern electron placement in atoms (Aufbau principle, Pauli exclusion principle, Hund’s rule) and it directly influences an element’s chemical properties and behavior in reactions.

Why this term fits best: it names the systematic distribution of electrons among available orbitals, not the ways atoms interact with others (which is chemical bonding), nor a specific case of a full outer shell (noble-gas configuration) or the group of elements (noble gases). A noble-gas configuration is a particular type of electron configuration—an example—while the general arrangement of electrons in an atom is precisely the electron configuration.