Question

What elements are in the air we breathe?

a) Nitrogen, oxygen, carbon dioxide, hydrogen, and argon
b) Nitrogen, oxygen, helium, and neon
c) Oxygen, carbon dioxide, nitrogen, and sulfur
d) Nitrogen, oxygen, carbon monoxide, and krypton

Answer 1

The elements in the air we breathe include nitrogen, oxygen, carbon dioxide, and argon, with nitrogen being the most abundant, followed by oxygen and argon, and small amounts of carbon dioxide, noble gases, and other trace gases.

Step-by-step explanation:

The elements in the air we breathe are nitrogen, oxygen, carbon dioxide, argon, and trace amounts of other gases. The most abundant gas in the atmosphere is nitrogen, which makes up about 78% of the air, followed by oxygen at around 21%, and argon at 0.9%. Carbon dioxide is present in a much smaller amount at approximately 0.03%. Other noble gases like neon, helium, and trace gases such as methane can also be found in very small quantities.