Examlex
Define the term biology.
Like Charges
Charges that are the same (either both positive or both negative) and repel each other according to Coulomb's law.
Opposite Charges
Charges that have different electrical signs, one positive and one negative, which attract each other.
Valence Shell
The outermost shell of an atom that contains the electrons most involved in chemical reactions.
Atom
The smallest unit of a chemical element, consisting of a nucleus of protons and neutrons, surrounded by electrons.
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