Crossword puzzle clue "it's noble and a gas"

Here are the possible solutions for it's noble and a gas clue

Answer
Clue
Relevancy
argon
Clue
Noble gas, and a homophonic hint to how this puzzle's four longest answers are formed
Noble gas
A noble gas
Most common noble gas
Earth's most abundant noble gas
Third noble gas
Noble gas, atomic number 18
Definition
an inert gaseous element
radon
Clue
It's noble and a gas!
Definition
a radioactive element, an inert gas

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