All matter is formed from ____, which form the smallest part of any substance that still retains the physical characteristic of that substance. Molecules are made up of ____. The atom is constructed of a central core called a ____, containing ____ and ____, and surrounded by orbiting ____. Protons are ____. Electrons are ____. Neutrons have ____ charge. The electron orbits are known as ____. Electrons in the outer shell are known as ____ electrons.

Electron Theory Missing Words

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