Question

Noble gases are inert because they have completed outer electron shells. Which of these elements isn't a noble gas?

Answer 1

The noble gases are the chemical elements in group 18 of the periodic table. They are the most stable due to having the maximum number of valence electrons their outer shell can hold. ... This chemical series contains helium, neon, argon, krypton, xenon, and radon.

Answer 2

Noble gases are inert because they have completed outer electron shells. Which of these elements isn't a noble gas?

a. Helium

b. Argon

c. Chlorine

d. Krypton

The element which is not a noble gas is c. Chlorine.

• Noble gases or inert elements are 18 group elements because they have fully filled valence shells.
• They have high ionisation but low or negligible electron gain enthalpy because of a filled valence shell.
• Helium, neon, argon, krypton and xenon are examples of noble gases.
• Chlorine is a halogen and 17 group element. it has a high tendency to gain one e17-group because after that its shell will be complete.
• Helium is used in deep-sea divings and neon is used in neon bulbs.
• Noble gases are called inert gases because they are none reactive gases in the periodic table.

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