Which one of the following has the highest neutrons ratio ?

Options

A. `._8 O^16`
B. `._2 He^4`
C. `._92 U^235`
D. `._26 Fe^56`

Answer

C

Explanation

( c) The representation `._92 U^235` shows `235` is mass number and `92` is atomic number.
Hence, number of neutrons =`235 - 92 = 143`
`._8 O^16` has `16` as mass number and `8` as atomic number.
Number of neutorn `= 16 - 8 = 8`
`._2 He^4` has `4` as mass number and `2` as atomic number.
Number of neutrons `= 4 - 2 = 2`
`._26 Fe^56` has `56` as mass number and `26` as atomic number,
Number of neutrons `= 56 - 26 = 30`
Hence, `._92 U^235` has highest neutrons ratio.