Why are electron in the atom s of conductors easy to knock-off?

Electrons in the outer shells of atoms in conductors, such as metals, are loosely bound to the nucleus due to a relatively low effective nuclear charge and the presence of additional inner electrons that shield the outer electrons. This makes it easier for these valence electrons to gain enough energy to escape from the atomic structure, allowing them to move freely and conduct electricity. Additionally, the metallic bonding in conductors allows for a "sea of electrons" that further facilitates their mobility.