Atomic Radius
The distance between the nuciues of an atom and its outermost electrons
Electronnegativity
A property of an element that indicates how strongly an atom of that element attracts electrons in a chemical bond
Electron Configuration
A list that show the distribution of an atoms electrons among energy levels and molecular orbitals
Ionization energy
the energy required to remove the most loosely held electron from an atom
period
a horizontal row on the periodic table; the elements within the same period have the same number of energy levels
peiodic law
natural law that states that the chemical and phyisical properties of elements are periodic function of their atomic numbers
periodic table
an arrangment of the elements by their atonmic numbers so that elements are periodic function of their of their atomic numbers
Sheilding Levels
The tendency for the electrons in the inner energy levels block the attraction of the nucleus for the valence electrons
Valence electrons
electrons in the outermost energy level of an atom