Learn about Noble Gases (惰性气体） 1 Have you ever ridden on a balloon? spots o行...

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问题 Learn about Noble Gases (惰性气体） 1 Have you ever ridden on a balloon? spots o行er balloon rides in order for people to see the beauty of a place A balbon contains a noble gas called helium (氦）.Formerly，balloons contains hydrpgen but hydrogen is very flammable and dangerous when uncontrolled.Therefore eople lifted to helium，which is safer. Helium is safe because it has the properties of the noble gases. 2 People once believed that noble gases couldn’t Chemically react at all. For this reason，they were called inert gases (惰性气).They we are also listed under Group 0 in the old periodic table because scientists believed that the gases have zero valence (价)electrons in their outer shell .This was later prove to be untrue when some noble gas compounds were discovered. 3 The gases are elements，which share similar properties.These properties include being monoatomic，colorless，odorless，being ablel conduct electricity，and having low chemical reactivity. Noble gases include HeMurJ，Neon，Argon，Krypton, Xenon and Radon. These are all found in Group 18，in the rightmost column of the periodic table. If you look at the periodic table，you will elements are the only ones，whichdo not have a charge. Helium has the molecular (分子的）weight while Radon is the heaviest. 4 Remember that chemical reactions occur because atoms have valence electrons，which are electrons in their outer she". When the outer shell is “unfied” or the electrons is not yet complete，the atom is more reactive. Noble gases have a full outer shell，meaning that they have complete electrons in their outer shell varies. For instance, the outer shell of Helium has 2 valence electrons while the outer shell of Xenon has 8 electrons. Nowadays，there remains to be a few noble gases because of the low chemical reactivity of these said gases. 5 Because of their properties，noble gases have many important applications. They are widely used in medicine and industries. For instance，liquid Helium is used for superconducting magnets (磁体）. These magnets are very important in physics and medicine. When a doctor suspects that a person’s brain has been damaged，he might request for Magnetic Resonance Imaging (MRI) .MRI allows the doctor to “see” the brain, without operating on the patient.

选项 A lightest B reactive C important D complete E flammable F unnecessary Among the elements of noble gases Helium is the ______.

答案 A

解析根据第三段最后一句：Helium has the lowest molecular (分子的）weight…

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Learn about Noble Gases (惰性气体） 1 Have you ever ridden on a balloon? spots o行...

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