In the context of atomic systems and the effects of gravity, the impact of time dilation and length contraction on the orbits of electrons is negligible. The reason is that the gravitational forces at play in atoms are relatively weak compared to other fundamental forces, such as electromagnetic interactions.
According to general relativity, gravitational fields can cause time dilation and length contraction. However, these effects become significant only in extreme gravitational environments, such as near massive objects like black holes or in the presence of extremely strong gravitational fields.
In the realm of atomic physics, the gravitational forces between the electrons and the nucleus are much weaker compared to the electromagnetic forces that hold the atom together. The effects of gravity on atomic systems are typically negligible and can be ignored in most cases. The dominant forces in atoms are electrostatic forces and quantum mechanical effects, which govern the behavior of electrons in their orbits.
To observe significant time dilation and length contraction due to gravity, one would need to consider much stronger gravitational fields than those found within atomic systems.