The region around the nucleus where electrons can be located is called?

Step 1: Analyze the question The question asks for the term used for the region around the nucleus where an electron is most likely to be found.

Step 2: Explain the concept Electrons do not move in fixed circular paths. According to quantum mechanics, we can only describe the probability of finding an electron in a certain region of space. That region is called an orbital.

• s orbital: spherical
• p orbital: dumbbell-shaped
• Each orbital holds a maximum of 2 electrons (with opposite spins).

Step 3: Check each option

• A. Spectra: These are the patterns of light (wavelengths) emitted or absorbed by atoms when electrons change energy levels. They are not a region of space.
• B. Orbital: This is the region around the nucleus where there is a high probability of finding an electron. ✔
• C. Quanta: These are discrete packets of energy (for example, a photon). They are not a region of space.
• D. Field: This is a general physics term, such as an electric or magnetic field. It is not the specific name for the electron region in an atom.

Step 4: Answer The correct option is B. an orbital.

Exam tip: Remember "Orbital = Orbiting region." Do not confuse an orbit (a fixed path in Bohr's old model) with an orbital (a probability region in the modern model). In WASSCE, "region/space where an electron is likely to be found" always points to orbital.