ELECTRONS, Is a subatomic particle with a negative one elementary electric charge., ATOMIC RADUIS, Is a measure of the size of its atom, ELECTRON AFFINITY, Is the amount of energy gained or released with the addition of an electron. T, ELECTRONEGATIVITY, May be the most important of the periodic properties you can learn and understand since so many other properties are depend on its value, IONIZATION ENERGY, Is the amount of energy required to remove an electron from an atom., QUANTUM NUMBER, The set of numbers used to describe the position and energy of the electron in an atom, PERIODIC PROPERTIES, Occur due to the recurrence of similar electronic configuration that is having the same number of electrons in the outermost orbit., GROUP TRENDS, Across a period, reactivity can change. For instance, halogens (Group 17) become less reactive as you move from fluorine to iodine because the added electron is further from the nucleus and experiences more shielding., ATOMIC SIZE, Atomic radius decreases across a period from left to right due to increasing nuclear charge, which pulls electrons closer to the nucleus., NOBLE GAS CONFIGURATION, a shorthand notation for representing the electron configuration of an element by using the electron configuration of the nearest noble gas with a lower atomic number.

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