It has no diameter because it is a point particle (it has nothing inside it). It has mass because the mass has been measured experimentally. If this is hard to imagine, science has lots more concepts even harder.
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Electrons are considered point particles, meaning they are considered to have no size or diameter. They have mass and charge, but their size is typically described as a point with no measurable dimensions.
The size of an electron is often described by the term "electron radius," which represents the distance from the center of the electron to the edge of its hypothetical spherical charge distribution. The approximate electron radius is about 2.82 x 10^-15 meters. However, it's important to note that electrons do not have a well-defined, physical size in the same way that macroscopic objects do.
The mass of an electron is atomic mass units is 5,485 799 090 70(16); the mass of the electron is not an atomic mass.
The electron has no atomic mass number. The mass of an electron is roughly 1/1800 of the mass of a proton or neutron.
The proton mass is about 2,000 times greater than the electron mass.
Mercury has a mass of about 0.055 times that of Earth and a diameter of about 4,880 kilometers.