Question

The existance of elements in isotopic forms result in:

• A. fractional molar mass
• B. some radioactive elements
• C. variation of number of neutrons
• D. all of the above

Answer 1

The correct option is D all of the above

When elements having the same atomic number but different atomic mass than they are called isotopes, this is due to variation in number of neutrons. The atomic mass of these elements is considered as an average of their respective isotopes, thus it can be in a fraction. Due to the difference in no. of neutrons, sometimes they become radioactive.