Question

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

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Answer 1

Explanation:

♥ They are also known as inert gases

♥configuration is np² np6

♥ ahelium , neon , argon , crypton , xenon and radon comes under noble gas group

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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

Among all of the four options, Chlorine is not a noble gas. (option c)

• To see if an element is a noble gas, we need to check its electronic configuration.
• Electronic configuration of Helium: 1s²; it has a filled outermost shell, so it is a noble gas.
• Electronic configuration of Argon: [Ne] 3s² 3p⁶; it has a filled outermost shell, so it is a noble gas.
• Electronic configuration of Krypton: [Ar] 3d¹⁰ 4s² 4p⁶; it has a filled outermost shell, so it is a noble gas.
• Electronic configuration of Chlorine: [Ne] 3s² 3p⁵; it does not have a filled outermost shell, and has a deficiency of 1 electron. So it is not a noble gas.
• Thus option c is correct.

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