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Asked by Manoj Roy

Apr 3, 2015

Explain why noble gases does not exist as diatomic species with suitable examples

Explain why noble gases does not exist as diatomic species with suitable examples.

Answers(2)

Answer

Satyanarayana Prasad

Member since Apr 24, 2013

Ans: Noble gases does not exist in diatomic in nature. From the molecular orbital theory it can best understood.
By taking example of Helium (noble gas)

Ex: Formation of Helium (He₂) molecule.

Electronic configuration of Helium atom = 1s²

Two 1s² orbitals combines to form two molecular orbitals.

Electronic configuration of Helium molecule = (σ1s)2 (σ*1s)2

Bond order in Helium molecule

=½ [(Number of bonding electrons) - (number of anti-bonding electrons)]

= ½ [2 -2]

= 0

Thus 'Zero' value indicates that Helium (He) molecule does not exist.

Sanalkumar S

Member since

it is because noble gases are having its valence shell filled with octect.so it do not need to form a covalent bond.eg:He,Ar etc.
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