Question
Which of the following is NOT an isotope of oxygen?
Solution
Oxygen has three stable isotopes: O-16, O-17, and O-18. O-15 is not a naturally occurring stable isotope of oxygen; it is radioactive.
Refrigerators keep food unspoiled because
The chief source of naphthalene is
Which of the following elements is not present in stainless steel?Â
An atom of an element has atomic number 17 and mass number36Â .The number of neutrons in its nucleus isÂ
Select the one which is not a mixture:
The resources which can be used continuously year after year ate called
- The element with highest first ionisation energy is