Ionization Energy Trends in the Periodic Table

Ionization energy is the energy needed to remove an electron from a gaseous atom or ion in its ground state. The first ionization energy, or IE1, removes the most loosely bound electron and forms a 1+ cation. The second ionization energy, IE2, removes the next electron, and each later ionization energy removes another electr...

The chemical behavior of atoms and ions is greatly affected by how easy or difficult it is to remove their electrons, especially the outermost electrons which participate in chemical bond formations.

The energy required to remove an electron from a gaseous atom in its ground state is called the first ionization energy and is given in kJ...