Examlex
In SQL, you use the NOT NULL clause in a CREATE TABLE command to indicate columns that cannot contain null values.
Lewis Structure
A graphical representation of the bonding between atoms in a molecule, showing valence electrons as dots.
Double Bond
A chemical bond in which two pairs of electrons are shared between two atoms, usually making the compound more reactive than a single bond.
Molecule
A molecule is a group of two or more atoms held together by chemical bonds.
Single Bonds
Chemical bonds formed by the sharing of one pair of valence electrons between two atoms, characterized by their relatively low energy.
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