Important ConceptsPeriodic TableAtomic SymbolsAtomic Masses Atomic Numbers Isotope Masses, Mass Number Metals, Nonmetals, and Metalloids Ionization Energy Electron Affinity Diagonal Variation of Physical Properties
Ionization EnergyEnergy needed to remove an electron completely from an atom. Always an endothermic reaction to remove an electron from a complete shell, a huge spike in ionization energy must be filled
Electron AffinityThe energy change that accompanies the addition of an electron to an atom. Electronegativity describes the amount of energy it takes to add an electron to a atom.
Diagonal Variation of Physical PropetiesConcept that elements Physical Properties trend in a diagonal line across the Periodic Table.