What is the present chemical composition of Earth's atmosphere?

Answer 1

The entire list is quite extensive, and can be found here:
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The composition of the atmosphere really does not change substantially over time. It is the relative increases/decreases in trace gases that affect much of our environment more than the three or four major components.

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Answer 2

Violet Adams

The present chemical composition of Earth's atmosphere consists primarily of nitrogen (about 78%), oxygen (about 21%), argon (about 0.9%), and trace amounts of other gases such as carbon dioxide, neon, helium, and methane.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.