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Answer :
In my opinion , answer is A
Explanation
Radius of neon atom : 69 pm =
Volume occupied by the one atom:
given that atoms are present in 1L
1 L = 0.001
The volume occupied by the neon atoms
Fraction of volume occupied by the neon atom:
The fraction of of volume occupied by the neon atom is very less than the 1 L which indicates the presence of large amount of empty space between the atoms of the gas.
Answer:
one kilogram is the answer