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The Periodic Table

Periodic table of elements

TermDefinition
Element Substance that cannot be split up into simpler substances by chemical means
Triad Group of three elements with similar chemical properties in which the atomic weight of the middle element is approximately equal to average of the other two
Newlands' Octaves Group of elements arranged in order of increasing atomic weight, in which the first and the eighth element of each group have similar properties
Mendeleev's periodic law When elements are arranged in order of increasing atomic weight, the properties of the elements vary periodically
Atomic number is the number of protons in nucleus of that atom
Modern Periodic Table Arrangement of elements in order of increasing atomic number
Mass Number Sum of the number of protons and neutrons in the nucleus of an atom of that element
Isotope atoms of an element (they have the same atomic number) that have different mass numbers
Relative atomic mass Average mass of atoms of element relative to 1/12 th the mass of carbon 12 atom
Aufbau Principle states when building up the electronic configuration of an atom in its ground state, the electrons occupy the lowest available level
Pauli exclusion principle no more than two electrons may occupy an orbital and they must have opposite spin
Created by: mrs kennedy
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