Question

1. what is an atomic orbital?

the orbit of an electron, much like a planet around the sun
a region of space where an electron is likely to be found
one of many orbits in which an atom can move

Explanation:

An atomic orbital is not a fixed orbit like a planet around the sun (that's the old - incorrect Bohr model). It is also not about an atom's movement. According to quantum mechanics, an atomic orbital is defined as a region of space where an electron is likely to be found.

Answer:

a region of space where an electron is likely to be found