ionization energy?

Question

how does ionization energy change as one proceeds accross the periodic table and how does it change as you move donw the periodic table?

Answer 1

As you go across the periodic table, the ionization energy generally increases because the charge of the nucleus increases, leading to a stronger nucleus-electron attraction.

When you go down a column, the ionization energy will decrease because the electron is farther away from the nucleus and is sort of "shielded" by more and more electrons between the outer ones and the nucleus.

Answer 2

As you go across the periodic table there is an increase in ionization energy becuz of the increasing nuclear charge. as you go down the periodic table (becuz it is easier to remove the electrons) the ionization energy of the elements decreases.

Answer 3

In both cases it increases across and down the periodic table....for a great illustration, look at the first table in the following;
http://en.wikipedia.org/wiki/Ionization_energy

where as i said above the ionization energy increases across and down the table, although there are a few exceptions.....as can be seen in the table.