A. Xenon
B. Neon
C. Helium
D. Argon
Correct Answer:
Option D – Argon
Explanation
Argon, with the symbol Ar which is the third noble gas, in group 18 makes up about 1% of the Earth’s atmosphere, making it the most common noble gas on Earth.
A. Xenon
B. Neon
C. Helium
D. Argon
Correct Answer:
Option D – Argon
Explanation
Argon, with the symbol Ar which is the third noble gas, in group 18 makes up about 1% of the Earth’s atmosphere, making it the most common noble gas on Earth.
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