Question

Which one of the following represents noble gas
configuration :
(a) 1s², 2s² 2p⁶, 3s² 3p⁶ 3d¹⁰, 4s² 4p⁶ 4d¹⁰, 5s² 5p⁶ 5d⁶, 6s²
(b) 1s², 2s² 2p⁶, 3s² 3p⁶ 3d¹⁰, 4s² 4p⁶ 4d¹⁰, 5s² 5p⁶ 5d¹, 6s²
(c) 1s², 2s² 2p⁶, 3s² 3p⁶ 3d¹⁰, 4s² 4p⁶ 4d¹⁰, 5s² 5p⁶
(d) 1s², 2s² 2p⁶, 3s² 3p⁶ 3d¹⁰, 4s² 4f¹⁴, 5s² 5p⁶ 5d¹

Answer 1

The option (c) represents noble gas configuration that is 1s², 2s² 2p⁶, 3s² 3p⁶ 3d¹⁰, 4s² 4p⁶ 4d¹⁰, 5s² 5p⁶.

Explanation:

• Xenon is a chemical element with atomic number 54.
• It is present in trace amounts in earth's atmosphere and crust.
• It is a colorless, dense, odorless noble gas.
• The Atomic number is 54 and Atomic mass is 131.293 u.
• As the atomic number is 54 so the number of electron in each shell are 2,8,18,18,8.
• As the noble gases are inert and don't take part in chemical reaction therefore their outermost shell is completely filled.

The option (c) represents noble gas configuration that is 1s², 2s² 2p⁶, 3s² 3p⁶ 3d¹⁰, 4s² 4p⁶ 4d¹⁰, 5s² 5p⁶.

Also learn more

Why noble gases are called inert gases? give reason and explain?

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Answer 2

The electronic configuration representing noble gas is 1s², 2s² 2p⁶, 3s² 3p⁶ 3d¹⁰, 4s² 4p⁶ 4d¹⁰, 5s² 5p⁶

Explanation:

Noble gas elements are those which contain octet configuration. that is they are inert elements due to having completely filled valence orbitals.

In given configurations, the one that have completely filled orbitals with octet configuration is 1s², 2s² 2p⁶, 3s² 3p⁶ 3d¹⁰, 4s² 4p⁶ 4d¹⁰, 5s² 5p⁶

This is the configuration of Xenon (atomic number 56)

the configuration can be generally represented as 2,8,8,10,8,10,8

Hence valence shell is octet.

Therefore the correct answer is option(c)