Final answer:
Zeus is the god depicted with a lightning bolt, a symbol of his status as the deity of sky and thunder in Greek mythology.
Step-by-step explanation:
The god depicted holding a lightning bolt is Zeus, the ruler of the Greek gods. In various art representations, Zeus is iconically shown with a lightning bolt, which is his attribute as the god of the sky and thunder. The Artemision Bronze, which depicts either Zeus or Poseidon, would therefore represent Zeus if the figure were originally holding a lightning bolt. Conversely, it would represent Poseidon if he were holding a trident, another indication of absence in the statue is what makes its identification challenging. Additionally, in literature, Zeus is often referred to as wielding lightning as an expression of his divine power.