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Answer:
NITROGEN
Possible Questions:
Primary constituent of air
It's in the air
Most of the atmosphere
Air, mostly
The atmosphere, mostly
Product of star fusion
Nearly 80% of the atmosphere
Much of the air
Ingredient of air
Four-fifths of the atmosphere
Explosive element
Element in laughing gas
Discovery of Daniel Rutherford
Almost 80% of the Earth's atmosphere
About 78 percent of our atmosphere