Blank is the most abundant gas in earths atmosphere

The answer to your question is nitrogen :)
Hope this helped!

Hey there!

There are many gases in the atmosphere - like greenhouse gases such as methane and carbon dioxide that lead to climate change, and water vapor and oxygen that help us. However, there's only one element that remains abundant throughout the entirety of the atmosphere, and that element is nitrogen. Nitrogen takes up nearly 78% of the atmosphere and leads in the composition of the atmosphere over an astounding 21% oxygen.

Hope this helps!

4.90 x 10 24 atoms

Explanation:

the 24 is the exponent for the 10