oxygen
krypton
chlorine
nitrogen
Answer is Right!
Answer is Wrong!
The correct answer is: D. nitrogen
Nitrogen is an inert gas because it does not react easily with other elements. It is the most abundant element in the Earth’s atmosphere, making up about 78% of the air we breathe. Nitrogen is also found in many fertilizers and explosives.
Oxygen is a gas that is essential for life. It is the second most abundant element in the Earth’s atmosphere, making up about 21% of the air we breathe. Oxygen is also found in water and in many minerals.
Chlorine is a greenish-yellow gas that is used in many industrial processes. It is also found in table salt and in bleach.
Krypton is a noble gas that is found in very small amounts in the Earth’s atmosphere. It is also used in some light bulbs and lasers.