PERIOD - Horizontal rows in Periodic Table, GROUP - Vertical columns in Periodic Table, BLOCK - Divided into 4 major regions, ATOMIC RADIUS - One-half of the average distance (d) between the two covalently bonded atoms, SHIELDING EFFECT - Caused by mutual repulsion of electrons for each other, IONIC RADIUS - The distance between the nucleus and the electron in the outermost shell of an ion, IONISATION ENERGY - The minimum energy required to remove an electron from an isolated gaseous atom or ion in its ground state, ELECTRONEGATIVITY - The relative ability of an atom to attract the bonding electrons to itself when combined with another atom by a chemical bond, OXIDE - A compound formed when an element reacts with oxygen, VALENCE ELECTRONS - Electrons located at the outermost shell of an atom,

PERIODIC TABLE

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