Answer:
The number of neutrons are different.
Explanation: -
In 17O
The mass number is 17
The atomic number for oxygen = 8
Number of neutrons of 17O = Mass number of 17O – atomic number
= 17-8
=9
In 16O
The mass number is 16
Number of neutrons of 16O = Mass number of 16O – atomic number
= 16-8
=8
The mass number is 18
The atomic number for oxygen = 8
Number of neutrons of 18O = Mass number of 18O – atomic number
= 18-8
=10
As we can see the number of neutrons are different in each case.