Here's why:
* Noble Gas: Helium is a noble gas. Noble gases are known for their extremely low reactivity due to their full outer electron shell.
* Non-Reactive: Helium doesn't readily form compounds with other elements because it's very stable on its own.
* Abundance: Helium is found in the Earth's atmosphere, although in very small quantities. It's also found in natural gas deposits.
To summarize: Helium is a noble gas, making it very unreactive. It exists in its pure elemental form in nature.
