Which gases in the following list exist as separate atoms: hydrogen, helium, nitrogen, oxygen, neon?
A. Helium and neon
B. Hydrogen and helium
C. Helium and nitrogen
D. Oxygen and nitrogen
Answer:A
Which gases in the following list exist as separate atoms: hydrogen, helium, nitrogen, oxygen, neon?
A. Helium and neon B. Hydrogen and helium C. Helium and nitrogen D. Oxygen and nitrogen