Periodic Table

Stephanie Lursen

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Alkali Metals:

Alkaline (Rare) Earth Metals:


Noble Gases:




Transition Metals:



Periodic Trends

Ionization Energy

The ionization energy (IE) of an atom or molecule describes the minimum amount of energy required to remove an electron (to infinity) from the atom or molecule in the gaseous state. Ionization energy values are typically very high and follow trends throughout the periodic table. The IE increase from bottom to top and left to right in the periodic table.

Atomic Radius

The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the nucleus to the boundary of the surrounding cloud of electrons. Since the boundary is not a well-defined physical entity, there are various non-equivalent definitions of atomic radius. Atomic Radius increases as you go down a column.


Electronegativity, symbol χ, is a chemical property that describes the tendency of an atom or a functional group to attract electrons (or electron density) towards itself. Electronegativity increases from left to right and it decreases from top to bottom.