1. Electronegativity
A measure of the ability of an atom that is bonded to another atom to attract electrons to itself.
Trend:
Increases from left to right
Exclude Noble Gases
Decrease top to bottom
Electronegativity

3. Ionization Energy
The energy required to remove an electron from a gaseous atom when the atom is in its ground state.
Trend:
Increases from left to right
Decrease from top to bottom

5. Atomic Radius An estimate of the size of an atom. Trend:
Decrease from left to right
Increase from top to bottom

8. Ionic Radius
How does the size of an atom change when electrons are added or removed?
As an Atom loses 1 or more electrons (becomes positive), it loses a layer therefore, its radius decreases.

9. Ionic Radius
How does the size of an atom change when electrons are added or removed?
As an Atom gains 1 or more electrons (negative), it fills its valence layer, therefore, its radius increases.

10. Ionic Radius Trend increases as move down the periodic table.
Lose electron – smaller
Gain electron - bigger