Chemistry
Grade-7
Easy

Question

Which is the 5th rare gas present in the atmosphere?

  1. He
  2. Ar
  3. Ne
  4. Xe

hintHint:

The atmosphere contains various gases.

The correct answer is: Xe


    • Xenon gas is the rarest gas on earth. Air contains only 0.000009% xenon. Therefore, it is only used when no other alternative lighter gas is available.
    • In addition to xenon, neon and krypton are present at 0.0018% and 0.00011%, respectively.
    • Applications of xenon gas include the manufacture of automotive headlights, semiconductors, plasma display panels, and flash cameras.
    • In addition, xenon also has medical applications, including its anesthetic properties.

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    Under standard temperature and pressure (STP) conditions, neon exists as

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    • Neon is a monatomic atom because it is an inert gas.
    • Noble gases have completely filled outer electron shells. This means that atoms do not have to gain or lose electrons.
    • Diatomic elements such as oxygen and nitrogen require electrons to fill their outer shells. When diatomic elements are not bonded to another element, they share electrons with another atom of the same kind. For this reason, oxygen and nitrogen are written as O2 and N2.
    • Neon is simply written Ne.

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    • Diatomic elements such as oxygen and nitrogen require electrons to fill their outer shells. When diatomic elements are not bonded to another element, they share electrons with another atom of the same kind. For this reason, oxygen and nitrogen are written as O2 and N2.
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