Along with an alpha particle what other product is produced in the alpha decay of americium-241

An alpha particle is a helium nucleus, meaning it contains 2 protons and 2 neutrons. This means the original americium-241 atom has lost 2 protons and 2 neutrons as well. You need to find two things to identify the other product: its atomic number and its atomic mass.

For atomic number: since americium (atomic number 95) lost 2 protons, the atomic number drops by 2, so the other product is an isotope of neptunium (atomic number 93). For atomic mass: since the original americium-241 lost the equivalent of 4 amu, the product will also be 4 amu lighter (237 amu).

This means the other product is neptunium-237.