BioMedical Admissions Test (BMAT) 2026 – 400 Free Practice Questions to Pass the Exam

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How do the densities of noble gases change as you move down the group?

They increase

As you move down the group of noble gases in the periodic table, the densities of these gases increase. This trend occurs due to two main factors: atomic size and mass.

Noble gases, which include helium, neon, argon, krypton, xenon, and radon, have a complete outer electron shell, making them chemically inert. However, each successive noble gas has an additional electron shell compared to the one above it. As a result, the atomic size increases down the group.

Alongside this increase in size, the atomic mass of the noble gases also rises significantly as you progress down the group. The increased mass, coupled with the larger volume that the atoms occupy due to their size, leads to a rise in density.

Therefore, the trend of increasing density reflects the combination of larger atomic masses and increased physical volume, clearly explaining why the densities of noble gases increase moving down the group.

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They decrease

They remain constant

They fluctuate

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