Why does the density of noble gases increase going down Group 0?

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Question

Why does the density of noble gases increase going down Group 0?

Accepted Answer

C) Heavier noble gas atoms have a greater mass, so a given volume contains more mass — Density depends on the mass of particles in a given volume. Going down the group, noble gas atoms have progressively greater relative atomic masses, so a fixed volume of the gas contains greater total mass, leading to higher density. The number of atoms per unit volume is similar for all gases at the same conditions.

Answer

A) The atoms are more tightly packed together in heavier noble gases

Answer

C) Heavier noble gas atoms have a greater mass, so a given volume contains more mass

Answer

B) Each noble gas has more electrons than the one above, increasing its mass

Answer

D) The boiling point increases, causing the gas to become denser

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