A) Helium
B) Argon
C) Xenon
D) None of these
- Helium is a light, colorless gas that is lighter than air, so it makes balloons float.
- It is used in important areas like cooling machines in hospitals, especially MRI scanners, because it stays very cold without freezing.
- Helium is rare and hard to get, so saving it is important because it helps in science, medicine, and technology.