Biology / Unit 1 Bio 0131 short lesson, about 20 seconds
Covalent Bonds
Captions available
The idea
A covalent bond forms when two atoms share one or more pairs of electrons between them.
In practice
Two hydrogen atoms share a pair of electrons to form a hydrogen molecule, each atom filling its outer shell in the process.
Where people slip
Sharing electrons is what distinguishes a covalent bond from an ionic bond, where electrons transfer completely instead.
Your place on the trail
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