Which gas is the heaviest among the listed elements?

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Multiple Choice

Which gas is the heaviest among the listed elements?

Explanation:
In this set, the weight of a gas grows as you go to heavier elements in the same group of the periodic table. The noble gases show this clearly: each step down adds more protons and neutrons, increasing the molar mass. Helium is very light (about 4 g/mol), neon is heavier (about 20 g/mol), krypton is heavier still (about 84 g/mol), and radon is the heaviest (roughly 222 g/mol). Since radon has the largest atomic number and the largest molar mass among these options, it is the heaviest gas.

In this set, the weight of a gas grows as you go to heavier elements in the same group of the periodic table. The noble gases show this clearly: each step down adds more protons and neutrons, increasing the molar mass. Helium is very light (about 4 g/mol), neon is heavier (about 20 g/mol), krypton is heavier still (about 84 g/mol), and radon is the heaviest (roughly 222 g/mol). Since radon has the largest atomic number and the largest molar mass among these options, it is the heaviest gas.

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