* Chemical elements are fundamental substances that cannot be broken down into simpler substances by ordinary chemical means. They are represented by symbols (e.g., H for Hydrogen, O for Oxygen).
* Helen of Troy is a figure from Greek mythology, known for her beauty and the Trojan War.
* "A night soldier" is a phrase that could refer to someone who fights at night or perhaps a soldier who is mysterious or unseen.
Therefore, linking a chemical element to these concepts is not scientifically or historically accurate.