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Why was the Song dynasty unable to completely secure its reign?
Negatively Charged
Refers to atoms or molecules that have gained one or more electrons, resulting in a net negative charge.
Molecule
The smallest physical unit of an element or compound, consisting of one or more atoms held together by chemical forces.
Ion
A molecule or atom that has acquired an overall electric charge from either losing or gaining electrons.
Hydrogen Bond
Hydrogen atoms bound covalently to either N or O atoms have a small positive charge that is weakly attracted to the small negative charge of other atoms, such as O or N; it can occur within a molecule or between different molecules.
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