Question
Which of the following names can be used for group VIII A elements?(a) Rare-earths(b) Inert gases(c) Rare gases of atmosphere(d) Noble gases
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These include helium, neon, argon, krypton, xenon, and radon. Show more…
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Until the early 1960 s the group 8 A elements were called the inert gases; before that they were called the rare gases. The term rare gases was dropped after it was discovered that argon accounts for roughly $1 \%$ of Earth's atmosphere. (a) Why was the term inert gases dropped? (b) What discovery triggered this change in name? (c) What name is applied to the group now?
For (a) rubidium (b) tungsten, (c) germanium, and (d) krypton, which of the following terms apply? (i) metal, (ii) nonmetal, (iii) metalloid (iv) transition element, (v) main group element, (vi) noble gas, (vii) alkali metal, (viii) alkaline earth metal.
a. Which elements are designated as the noble gases? b. What is the most significant property of these elements?
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