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LSH PScience 19B

Periodic Table

TermDefinition
Atomic Number The number of protons in the nucleus of an atom
Mass Number The number of protons and neutrons in the nucleus of an atom
Isotope A version of an atom with a different mass
Average Atomic Mass The average mass of all the isotopes that exist of a given element
Periodic Table An arrangement of all the elements by atomic number and patterns of chemical properties
Group A vertical arrangement on the periodic table of elements with similar chemical properties
Electron Dot Diagram A way of representing the valence electron configuration of an element
Period A horizontal arrangement of elements on the periodic table
Valence Electrons The highest energy electrons responsible for reactivity (outer "shell" electrons)
Atomic Shell Model A way of representing atomic structure with electrons in "shells" surrounding nucleus according to energy level
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