Ordinary oxygen contains.

Options

A. only `O^7` isotopes
B. only `O^16` isotopes
C. a mixture of `O^16 , O^17` and `O^18` isotopes
D. a mixture of `O^16` and `O^18` isotopes.

Answer

C

Explanation

Ordinary oxygen contains three isotopes of `O^(16), O^(17) ,O^(18)` in the ratio of about 10,000 : 1 : 8.