Periodic Table & Atomic Structure - Key Terms #2

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Number of protons in the nucleus of an atom
A region of definite energy that an electron can occupy in an atom
The number of protons and neutrons in an atom of the element
Region in space around the nucleus in which there is a high probability of finding the electron
The mass of an atom of an element compared with one-twelfth of the mass of the carbon-12 isotope
Mass of a molecule compared to the mass of one-twelfth the mass of the carbon-12 isotope