Science / Periodic Table of Elements / Ionization Energy (IE): The energy required to remove the outermost electron from an atom or a positive ion in its ground level. The table lists only the first IE in eV units. To convert to kJ/mol multiply by 96.4869. Reference: NIST Reference Table on Ground levels and ionization energies for the neutral atoms. IE decreases going down a column of the periodic table, and increases from left to right in a row. Thus, alkali metals have the lowest IE in a period and Rare gases have the highest.
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Science / Chemistry / Internal Energy: Internal energy (U) is defined so that changes in internal energy (deltau) are equal to the heat absorbed or released by a process running at constant volume. While changes in internal energy can be m MORE
Science / Chemistry / Ionization Energy: The energy needed to remove an electron from a gaseous atom or ion. MORE