Question

Calculate the neutrons ratio for the isotopes $O^{16}$ and $O^{18}$.

• A. 8 : 10
• B. 4 : 5
• C. 9 : 8
• D. 1 : 1

Answer 1

Answer: (A), (B)

The correct options are
A 8 : 10
B 4 : 5

Atomic no. of $O=8$
In $O^{16}$ mass no$=16$; thus no. of neutrons $=16-8=8$
In $O^{18}$ mass no$=18$; thus no. of neutrons $=18-8=10$
Therefore the ratio = $8:10or4:5$