Question

What is the total number of neutrons in an atom of 57/26 Fe?
a-83
b-57
c-26
d-31

Answer 1

Answer : The correct option is, (d) 31

Explanation : The given atom is,
`^(57)_(26)Fe`

Given :

Atomic mass number = 57

Atomic number = 26

Atomic number = Number of protons = Number of electrons = 26

Now we have to calculate the number of neutrons.

Number of neutrons = Atomic mass number - Atomic number

Number of neutrons = Atomic mass number - Atomic number = 57 - 26 = 31

Hence, The total number of neutrons present in an atom of
`^(57)_(26)Fe` is, 31 neutrons.