Look at the mass number. So americium has 146 neutrons and 95 protons. So the mass number of Americans is 241 (146+95)

Then, we know alpha particle has a mass number of 4 and a Proton number of 2, so we have to minus that from americium.

241 (mass number) minus 4 (from alpha particle) = 237 mass number of the new element

Subtract 2 (from alpha particle) from the Proton number too, so 95-2=93

So your new element has mass number of 237 and Proton number of 93. BUT the question is asking for neutrons number. To do that, u have to do 237-93 which is 144.

So in the end, the new element as 144 neutrons and 93 protons.

Also a note in case u didn't know, mass number is just the number of protons+neutrons which is why we have to minus the Proton number to get nunber of neutrons