Answer:- There would be 30 neutrons.
Solution:- We know that:
atomic mass = protons(mass of 1 proton) + neutrons(mass of 1 neutron)
atomic mass is given as 54.9380 u. Mass of proton is 1.0073 u and mass of neutron is 1.0087 u.
Atomic number for Mn is 25 means it has 25 protons. Let's plug in the values in the formula and calculate the number of neutrons for it.
54.9380 = 25(1.0073) + n(1.0087)
where n is the number of neutrons.
54.9380 = 25.1825 + 1.0087n
54.9380 - 25.1825 = 1.0087n
29.7555 = 1.0087n
n = [tex]\frac{29.7555}{1.0087}[/tex]
n = 29.5
It could be round to 30.
So, there would be 30 neutrons in an atom of Mn.
