Answer :
I believe the correct answer is C. The number of neutrons in the 253/100 Fm would be 153. The numbers beside Fm are used to determine this. Two hundred fifty three represents the mass number which is the sum of protons and neutrons in the nuclide while 100 represents the atomic number which is the number of protons. Therefore,
253 = neutrons + 100
neutrons = 153
253 = neutrons + 100
neutrons = 153
Answer : The correct option is, (C) 153
Explanation :
Atomic number is defined as the number of protons or number of electrons.
Atomic number = number of protons = number of electrons
Mass number is defined as the sum of number of protons and number of neutrons.
Number of neutrons = Mass number - Number of protons
or,
Number of neutrons = Mass number - Atomic number
As we are given that:
The given nuclide is, [tex]^{253}_{100}Fm[/tex]
'Fm' is the fermium element.
Mass number of 'Fm' = 253
Atomic number f 'Fm' = 100
Now we have to determine the number of neutrons.
Number of neutrons = Mass number - Atomic number
Number of neutrons = 253 - 100
Number of neutrons = 153
Therefore, the number of neutrons in the 'Fm' nuclide have 153.