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Chem Chap4


Element A substance that cannot be split into simpler substances by chemical means
Compound A number of elements chemically combined.
Triad A group of 3 elements with similar chemical properties in which the atomic weight of the middle element is approximately the average of the 1st and 3rd.
Newlands' Octaves The elements are arranged in order of increasing atomic weight and the 1st and 8th have similar chemical properties.
Mendeleev's Periodic Law The elements are arranged according to atomic mass and the properties vary periodically.
Atomic Number The amount of protons in the nucleus of an atom.
Modern Periodic Table The elements are arranged in increasing atomic number and the properties vary periodically.
Mass Number The sum of the protons and neutrons in the nucleus of an atom
Isotopes Atoms of the same element that have the same atomic number but different mass number due to the different amount of neutrons in the nucleus.
Relative Atomic Mass The average of the mass of the isotopes of an elements, as they occur naturally and taking their abundances into account.
Aufbau Principle When building up an electronic configuration of an atom in its ground state, the electrons must occupy the lowest available energy level.
Hund's Rule of Maximum Multiplicity When there are two or more orbitals of the same equal energy the electrons much fill them singly before in pairs.
Pauli Exclusion Principle Only two electrons can occupy and orbital and they must have opposite spin.
Created by: lisa.smyth97



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