Examlex
Use a double-angle formula or half-angle formula to simplify
Elemental Mass
The mass of a single atom of an element, typically measured in atomic mass units (amu) or grams per mole.
Periodic Table
A tabular arrangement of the chemical elements, organized on the basis of their atomic number, electron configurations, and recurring chemical properties.
Proton Count
The number of protons in the nucleus of an atom, which determines the chemical element of the atom and is denoted as the atomic number.
Eka-Aluminum
A historical name for gallium, predicted by Mendeleev using his periodic table before it was discovered, exhibiting similar properties to aluminum.
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