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Periodic Table

QuestionAnswer
Element a substance that cannot be split into simpler substances by chemical means
Triad a group of three elements with similar chemical properties in which the atomic weight of the middle element is approximately equal to the average of the other two
Newlands' Octaves groups of elements arranged in order of increasing atomic weight, in which the 1st and 8th element of each group have similar properties
Mendeleec's Periodic Law when elements are arranged in order of increasing atomic weight, the properties of the elements vary periodically
Modern Periodic Table an arrangement of elements in order of increasing atomic number
Isotopes atoms of the same element that have the same atomic number but different mass numbers
Aufbau Principle when building the electronic configuration of an atom in its ground state, the electrons occupy the lowest available energy level
Hund's Rule of Maximum Multiplicity when two or more orbitals of equal energy are available, the electrons occupy them singly before filling them in pairs
Pauli Exclusion Principle no more than two electrons may occupy an orbital and they must have opposit spin
Created by: OscarE