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Elements with atomic numbers 7, 8, 9 and...

Elements with atomic numbers 7, 8, 9 and 10 are gases. Under similar conditions, which gas has highest rate of diffusion? Why?

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gas with atomic number 10 (neon) has highest rate of diffusion.
The rateof diffusion of Ne is high because, gas with Z value 10, has least molecular weight among the four gases given.
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