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2 years ago

Which of these elements is a noble gas? A. hydrogen (H) B. barium (Ba) C. nitrogen (N) D. krypton (Kr) E. bromine (Br)

Chemistry

2 answers:

Citrus2011 [14]2 years ago

7 0

<u>Answer: </u>The correct answer is Option D.

<u>Explanation:</u>

Noble gases are defined as the gases which have stable electronic configuration and is highly nonreactive. These belong to Group 18 of the periodic table.

For the given options:

<u>Option A:</u> Hydrogen (H)

The electronic configuration of hydrogen = $1s^1$

This element belongs to Group 1 and is known as alkali metal.

<u>Option B:</u> Barium (Ba)

The electronic configuration of barium = $[Xe]6s^2$

This element belongs to Group 2 and is known as alkaline earth metal.

<u>Option C:</u> Nitrogen (N)

The electronic configuration of nitrogen = $1s^12s^22p^3$

This element belongs to Group 15 and is known as p-block element.

<u>Option D:</u> Krypton (Kr)

The electronic configuration of krypton = $[Ar]4s^23d^{10}4p^6$

This element belongs to Group 18 and is known as noble gas.

<u>Option E:</u> Bromine (Br)

The electronic configuration of bromine = $[Ar]4s^23d^{10}4p^5$

This element belongs to Group 17 and is known as halogen.

Hence, from the above information, the correct answer is Option D.

Novosadov [1.4K]2 years ago

5 0

Krypton is a noble gas! Hope this helps!

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