Final answer:
The region of the space called orbital is where an electron is present most of the time
Step-by-step explanation:
The region of space where an electron is present most of the time is known as an orbital. An electron orbital is the three-dimensional space around the nucleus of an atom where there is a high probability of finding an electron. Unlike the outdated concept of electrons orbiting the nucleus like planets around the sun, modern quantum mechanics describes these locations as probabilistic 'clouds' that show where an electron might be at any given time.
Each electron orbital can contain a maximum of two electrons, and electrons fill these orbitals according to specific rules based on their energies. The concept of an electron cloud also provides a way of visualizing electron position: as a density map where more dense areas indicate a higher likelihood of electron presence.
However, it's crucial to understand that this model reflects the quantum nature of electrons, meaning that there is no exact path that an electron follows. Instead, the orbitals represent a boundary within which the electron is most likely to be found. This is akin to a cloud, where the density of the cloud represents the likelihood of finding the electron at any point within the cloud.