Question

All noble gases are

a odorless.
b colorless.
c radioactive.
d two of the above

Answer 1

All noble gases are colorless and odorless, and they are not radioactive.

Step-by-step explanation:

All noble gases are colorless and odorless. They do not have any noticeable smell and they are transparent or faintly colored in their natural state. However, they are not radioactive.

Learn more about Noble gases