The noble gases, which are in Group 0 of the Periodic Table, are all very 1. $$\(\ldots 2 \ldots \ldots\)$$. one of these gases, is used to provide an inert atmosphere in lamps. Another, 3, is used for filling balloons because it is less dense than air. Which words complete the sentences about noble gases?
A.
B.
C.
D.
Exam No：0620_s15_qp_13 Year：2015 Question No：19
Answer:
C
Knowledge points:
8.4.1.1. have high densities
8.4.1.2. have high melting points
8.4.1.3. form coloured compounds
8.4.1.4. often act as catalysts as elements and in compounds
8.4.2. Describe transition elements as having ions with variable oxidation numbers, including iron(II) and iron(III)
8.5.1. Describe the Group VIII noble gases as unreactive, monatomic gases and explain this in terms of electronic configuration
Solution:
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