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Question

Which Elements are non reactive?


A

Oxygen

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B

Hydrogen

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C

Helium

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D

Carbon

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Solution

The correct option is C

Helium


The explanation for the correct answer

(C) Helium

  1. Helium He is the element of group 8 and period 1 having the Atomic number 2.
  2. The electronic configuration of Helium He is 1s2.
  3. As the valence shell of Helium He is fully filled therefore it is unreactive.
  4. Helium He is an inert gas and inert gases are generally unreactive.

The explanation for the incorrect answer

(A) Oxygen

  1. Oxygen O is the element of group 16 and period 2 having the atomic number of 16.
  2. The electronic configuration of Oxygen O is He2s22p4.
  3. As the valence shell of Oxygen O is not completely filled, it needs two more electrons to achieve noble gas configuration and Thus Oxygen O is very reactive.
  4. Oxygen O being electronegative it is highly reactive.

(B)Hydrogen

  1. HydrogenH is the first element of periodic table having the atomic number of 1.
  2. The electronic configuration of HydrogenH is 1s1.
  3. As the valence shell oh HydrogenH has only one electron and thus hydrogen can lose this electron easily and becomes H+.
  4. Thus HydrogenH being electropositive is highly reactive.

(D) Carbon

  1. Carbon C is the element of group 14 and period 2 having the atomic number of 6.
  2. The electronic configuration of Carbon C is He2s22p2.
  3. As the valence shell of Carbon C is not completely filled , it needs four electrons to achieve the noble gas configuration and thus Carbon C forms covalent bond (bond by sharing of electrons).
  4. Thus, Carbon C is reactive element.

Thus, Helium is unreactive element. Therefore, option C is correct.


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