what are the appropriate masses of the subatomic particles expressed in atomic mass unit

Which subatomic particles? Some have no mass at all.

To determine the appropriate masses of subatomic particles expressed in atomic mass unit (amu), you can refer to the periodic table. Here are the approximate masses:

1. Proton: The mass of a proton is approximately 1 amu. You can find this information by locating the element hydrogen (H) on the periodic table. The proton is the subatomic particle found in the nucleus of the atom, and it has a positive charge.

2. Neutron: The mass of a neutron is also approximately 1 amu. You can find this information by locating any element on the periodic table. The neutron is another subatomic particle found in the nucleus of the atom, but it has no charge.

3. Electron: The mass of an electron is much smaller compared to a proton or neutron. It is approximately 0.0005 amu (or 1/1836 amu). The mass of an electron is negligible when compared to protons and neutrons. It is denoted as a subscript (e-) on the periodic table.

Please note that these values are approximate and may vary slightly depending on the specific isotope of an element.