No, a helium atom is not considered a molecule. A molecule is a combination of two or more atoms held together by chemical bonds. In the case of helium, it exists as a monatomic gas, meaning it consists of individual helium atoms that are not chemically bonded to each other.
Helium is an inert gas and belongs to the noble gas group in the periodic table. Noble gases, including helium, neon, argon, krypton, xenon, and radon, are characterized by having a full complement of electrons in their outermost energy level (valence shell). As a result, these atoms have little tendency to bond with other atoms to form molecules.
Helium atoms are stable and prefer to exist independently as single atoms rather than forming chemical bonds with other helium atoms or different elements. Therefore, helium is not typically referred to as a molecule but rather as a noble gas consisting of individual helium atoms.