Examlex
Children in upper-elementary grades can:
Atom
The basic unit of a chemical element, consisting of a nucleus surrounded by electrons.
Neutron
A neutron is a subatomic particle found in the nucleus of an atom, lacking an electric charge and possessing a mass slightly greater than that of a proton.
Electron
A subatomic particle with a negative electric charge, fundamental to chemical bonding and electricity.
Peripheral Nervous System
A part of the nervous system that consists of the nerves and ganglia outside of the brain and spinal cord.
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