Examlex
Yi Ling experiences her first menstrual period two months after her twelfth birthday. This event is called ________ and it represents development of a ________ sex characteristic.
Molecular Formula
A notation that indicates the number and type of atoms in a molecule but not their structural arrangement.
Elements of Unsaturation
A measure used in organic chemistry to determine the number of π bonds and rings in a molecule.
Carbon-Carbon Single Bonds
Bonds formed by the sharing of a single pair of electrons between two carbon atoms.
Carbon-Carbon Double Bonds
A chemical bond between two carbon atoms involving four bonding electrons instead of the usual two, leading to the formation of alkenes.
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