Helium has 2 valence electrons.
Helium is a noble gas with an atomic number of 2, which means it has two electrons in total. These two electrons fill the first and only energy level of helium, adhering to the octet rule in a unique way. While most elements aim to have eight electrons in their outer shell for stability, helium achieves stability with its complete first shell of two electrons. This makes helium chemically inert and unlikely to form bonds with other elements under normal conditions.