Examlex
The most common time for a spontaneous abortion, or miscarriage, is during the third trimester.
Protons
Protons are subatomic particles found in the nucleus of an atom with a positive electric charge.
Electrons
Subatomic particles with a negative charge, found in all atoms and playing a key role in chemical reactions and electricity.
Hydrogen Bonding
A weak type of chemical bond that is common in water and organic compounds, forming between a hydrogen atom and a more electronegative atom.
Compound
Substance having two or more different elements in a fixed ratio.
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