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Atomic Size (radius)
Measure of the distance from the nucleus to the outer valence shell.
Ionization
The amount of energy needed to pull a valence electron from an atom in its gaseous state.
Electron Affinity
How much an atom wants an electron from another atom.
Metallic Character
How much like a metal an element is.
Atomic radius and Metallic character
Get larger from right to left and from top to bottom.
Ionization and Electron Affinity
Get larger from left to right and from bottom to top.