The atomic mass of protium (the most common isotope of hydrogen) listed on the periodic table does not include the mass of an electron. The atomic mass provided in the periodic table represents the mass of the nucleus, which includes the protons and neutrons.
The mass of an electron is much smaller compared to the mass of a proton or neutron, so it is generally neglected when determining the atomic mass. For most practical purposes, the mass of an electron is considered negligible in comparison to the nucleus. Therefore, the atomic mass of protium listed on the periodic table refers only to the mass of the proton in the nucleus.