In which metal is the outer electron held most strongly to the nucleus?

In general, the outer electron is held most strongly to the nucleus in transition metals, particularly those with a high effective nuclear charge and fewer electron shells. Among the metals, tungsten (W) is often cited as having a very strong attraction due to its high atomic number and significant nuclear charge, which results in a strong pull on its outer electrons. However, the strength of this attraction can also vary based on specific factors like electron shielding and atomic radius.