why argon is considered as a non polar molecular solid?

Argon does not possess any type of charge due to neighbour atom therefore has zero polarity. Thus argon is considered as non-polar molecular solid. The argon atoms are held by weak dispersion forces or London forces. 

Usually, these non-polar molecular solids are soft and non-conductors of electricity. They have low melting points and are usually in liquid or gaseous state at room temperature and pressure.

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it is because argon-argon electronegativity is same. as a result, the electron pairs stay at the centre and there are no formation of poles. as a result it is non polar.

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