1). Atom Radius
 It is the distance from the atomic nucleus to the electrons out in the skin.
 The fingers atom is influenced by the size of the atomic number element.
 The number of atomic elements multitude, the more the number of skin electron, so that the larger the fingers atom.
So: in one group (from top to bottom), fingers atom bigger.
 In one period (from left to right), increasing the number atom means increasing cargo core, while the number of skin electron remain. As a result of pulling the core electrons the big, causing the small fingers atom.
So: in one period (from left to right), spoke atom the less.

2). Ion radius
 Ion fingers have a significantly different (significant) compared with the fingers neutral atom.
 Ion be positive (cation) have fingers of smaller, whereas had a negative ion (anion) have fingers larger if compared with the fingers netralnya atom.


3). Ionization energy (kJ.mol-1)
 It is the minimum required energy neutral atoms in gas form to release one electron so that the ion had formed +1 (cation).
 If the atom is to deliver the second electron will be required a greater energy (called the second ionization energy), dst.