Periodic Table Trends

Summary of Periodic Table Trends. Moving Left  Right Atomic Radius Decreases Ionization Energy Increases Electronegativity Increases. Periodic table of electronegativity using the Pauling scale → Atomic radius ... molecule to attract electrons to itself. Electronegativity, metallic nature and atomic radius. ... Groups of the Periodic Table; Valence Electrons; Periodic Table Trends: Ionization Energy. Patterns of electronegativity in the Periodic Table. Electronegativity is a measure of an atom's "pull" on electrons. It is affected by the distance from the nucleus, electron-electron charge repulsion. Trends in Electronegativity in Periods of the Periodic Table In general, electronegativities of the elements in the same Period increases as you go from left to right. Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.The Pauling scale is the most commonly used. Fluorine (the most electronegative element) is assigned a value of 4.0, and values range down to caesium and francium which are the least electronegative at 0.7.  If the atoms are equally electronegative, both have the same tendency to attract the bonding pair of electrons, and so it will be found on average half way between the two atoms. No electronegativity difference between two atoms leads to a pure non-polar covalent bond.A small electronegativity difference leads to a polar covalent bond.A large electronegativity difference leads to an ionic bond.