Examlex
Based on the fossil record, which group appeared first?
Single Covalent
A type of chemical bond where two atoms share one pair of electrons.
Ionic Bond
A chemical bond formed between two ions with opposite charges through the transfer of electrons from one atom to another.
Triple Covalent
A type of chemical bond where three pairs of electrons are shared between two atoms.
Hydrogen Bond
An unstable linkage between two molecules due to the electrostatic force acting between a proton within one molecule and an electronegative atom in the other.
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