No, the strong nuclear force does not get weaker as you go up in atomic number. The strong nuclear force is the fundamental force responsible for binding protons and neutrons together in the atomic nucleus. It is an extremely powerful force, but it has a very short-range, acting only within the range of atomic nuclei.
The strength of the strong nuclear force remains relatively constant within the range of atomic nuclei. It is not dependent on the atomic number of the nucleus. The force is strong enough to overcome the repulsive electromagnetic force between positively charged protons, thus holding the nucleus together.
It's important to note that the electromagnetic force, which governs the interaction between charged particles, becomes stronger with increasing atomic number. This is because the number of protons (positive charges) in the nucleus increases, leading to a stronger electromagnetic repulsion between the protons. However, the strong nuclear force counteracts this repulsion, keeping the nucleus stable.