Noble Gases - The Gases In Group 18

This video tutorial explores noble gases, which are group 18 elements known for their full valence electron shells, making them stable and mostly non-reactive. The tutorial covers their properties, such as being colorless and monotonic, and their increasing boiling points and densities down the group. It also highlights various applications, including helium in balloons, xenon in car headlights, and radon in radiotherapy. The video concludes with advanced uses like krypton in insulation and xenon in satellite propulsion.

Which of the following is a characteristic of noble gases that contributes to their stability?

• They are metallic in nature.

• They are highly reactive.

• They have incomplete valence shells.

• They have full valence shells.

What happens to the atomic size and boiling point of noble gases as you move down the group?

• Atomic size decreases and boiling point increases.

• Atomic size increases and boiling point decreases.

• Atomic size decreases and boiling point decreases.

• Atomic size increases and boiling point increases.

Why is helium used to fill party balloons?

• It is less dense than air.

• It is more dense than air.

• It reacts with air to create lift.

• It is cheaper than other gases.

Which noble gas is used in car headlights to improve road safety?

• Radon

• Xenon

• Neon

• Helium

In the space industry, which noble gas is used as a propellant for steering satellites?

• Xenon

• Krypton

• Argon

• Neon