Question 1:

Which group of elements in the periodic table are commonly referred to as the noble gases?

Explanation: The correct answer is C) Group 18. The noble gases, including helium, neon, argon, krypton, xenon, and radon, are located in Group 18 of the periodic table.

Question 2:

Which of the following statements about noble gases is true?

Explanation: The correct answer is A) They have complete outer electron shells. Noble gases have full valence electron shells, making them stable and less likely to form chemical bonds with other elements.

Question 3:

Which noble gas is used in lighting to produce a bright orange-red glow?

Explanation: The correct answer is B) Neon. Neon gas is commonly used in lighting, such as neon signs, to produce a bright orange-red glow when an electric current passes through it.

Question 4:

Which property of noble gases contributes to their use in filling balloons and airships?

Explanation: The correct answer is C) Low reactivity. Noble gases have low reactivity and do not easily undergo chemical reactions, making them suitable for filling balloons and airships where stability and non-reactivity are desired.

Question 5:

Which noble gas is used in cryogenic applications to achieve extremely low temperatures?

Explanation: The correct answer is A) Helium. Helium is widely used in cryogenic applications, such as cooling magnets in MRI machines and achieving extremely low temperatures close to absolute zero.