Neon lights are tubes filled with neon gas. When electricity runs through them, the molecules get excited and the electrons jump to a higher energy level. When they fall back they emit a certain wavelength of light equal to the distance they fall back. Neon lights are red–orange.
Zero group or Group 18 Elements
Neon lights are the commonly used colorful and bright decoration lights. They are named so because of the gas used in them. Neon emits light when electricity excites the atomic electrons. Neon belongs to a family of gases known as noble gases or inert gases, which means unreactive. They belong to the Group 18 of the periodic table starting with Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe) and Radon (Rn). Mnemonic: Here are the New Arrivals. So, Karan is eXit ed to Ride.
If you see the electrons in the atomic orbit in noble gases, they are completely filled. This family of noble gases has been put as group 18 [or zero], at the end of the periodic table because they were not known when the periodic table was first thought about. Nobody knew that they were present because they were so unreactive. The bond between the atoms is so weak that at ordinary temperatures they exist as gases.
The last orbital in all is full or completed. There is no unpaired electron. So the valency is zero. Helium has two and other gases have eight electrons in their outermost shell. So, these shells are full. This makes them very stable. They do not react with other atoms, so they exist as single atoms or they are monoatomic gases.