Helium (HE) Has an Atomic Number of 2

Question

Helium (HE) has an atomic number of 2. It is chemically stable because it
A) is neutral in electrical charge.
B) readily ionizes to react with other atoms.
C) has a full outer electron shell.
D) will form a covalent bond with another He atom.
E) lacks electrons, thus the He atom is stable.

Accepted Answer

Helium has two electrons, filling its only electron shell. It does not need to gain or lose any electrons to achieve stability, and as such, it is chemically inert.