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chemistry key words

TermDefinition
element a substance that cannot be split into simpler substances by chemical means
Mendeleevs Periodic Law when elements are arranged in order of increasing atomic weight, the properties of the elements are repeated at regular intervals in other elements
atomic number number of protons in the nucleus of that atom
modern periodic law when elements are arranged in order of increasing atomic number, the properties of that element are repeated at regular intervals
mass number the sum of the number of protons and neutrons in the nucleus of an atom of that element
isotopes atoms of the same element which have different mass numbers due to different number of neutrons in nucleus
electron configuration shows the arrangement of electrons in an atom of an element
Aufbau principle when building up configuration of an atom in its ground state, the electrons occupy lowest available energy levels
Hunds Rule of Maximum Multiplicy when 2 or more orbitals of equal energy are available the electrons occupy them singly before filling them in pairs
Pauli Exclusion Principle no more than 2 electrons may occupy an orbital and they must have an opposite spin
Created by: user-1986716
 

 



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