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Bohr Diagram
A visual model that shows the protons, neutrons, and electrons in an atom, placing electrons in shells orbiting the nucleus where Shell 1 holds a maximum of 2, Shell 2 holds 8, Shell 3 holds 8, and Shell 4 holds 18.
Valence Electrons
The electrons located in the outermost shell of an atom, corresponding to the last digit of the atom's group number on the periodic table.
pH Scale
A scale ranging from $$1