How to identify curium mass number?
Here's how you can do that.
Grab a Periodic Table and look for curium,
Now, in order to find the mass number of the most abundant isotope of curium, you need to take the atomic mass, which is added at the bottom of the element cell
and round it to the nearest whole number.
You will end up with
#247.070 ~~ 247#
This means that the most abundant isotope of curium, curium-247, has a mass number equal to
Since curium has an atomic number equal to
#"96 protons " + " ? neutrons" = 247#
This tells you that curium-247 contains
#"no. of neutrons" = 247 - 96 = 151#
neutrons inside its nucleus.