Atomic structure and Matter

chemistry = the study of the properties of matter and the changes it undergoes

Isotope = an element that has varying numbers of neutron, which changes the mass of that element

homogeneous mixture = also known as a solution; varying composition of at least 2 substances, but appears to be uniform

deuterium = is an isotope of hydrogen, which contains 1 proton and 1 neutron (the most common for of hydrogen has 0 neutrons)

Nucleus = (Rutherford- Gold Foil experiment = small, dense, central component of an atom with a positive charge

Quantum Mechanics = a theory used to locate the 'probablity' of finding an electron (using the Uncertainty Principle)

energy level = a specific energy that may be possessed by electrons in an atom

energy sublevel = a specific energy that may be possessed by electrons within an evergy level

excited state = elecrton configuration showing that the outer electron absorbing energy

ground state = electron configuration showing all electrons in their normal state

Hund's rule = 1 electron must occupy an orbital befor e2 electrons can occupy the same orbital within a specific energy level

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